{"id":239,"date":"2026-03-27T16:23:08","date_gmt":"2026-03-27T16:23:08","guid":{"rendered":"https:\/\/www.go-minder.com\/vi\/comprehensive-guide-modeling-a-telephony-call-control-system-using-uml-state-machine\/"},"modified":"2026-03-27T16:23:08","modified_gmt":"2026-03-27T16:23:08","slug":"comprehensive-guide-modeling-a-telephony-call-control-system-using-uml-state-machine","status":"publish","type":"post","link":"https:\/\/www.go-minder.com\/vi\/comprehensive-guide-modeling-a-telephony-call-control-system-using-uml-state-machine\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n: M\u00f4 h\u00ecnh h\u00f3a m\u1ed9t H\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n cu\u1ed9c g\u1ecdi \u0111i\u1ec7n tho\u1ea1i b\u1eb1ng S\u01a1 \u0111\u1ed3 M\u00e1y tr\u1ea1ng th\u00e1i UML"},"content":{"rendered":"<h2>\ud83c\udfaf T\u1ed5ng quan<\/h2>\n<p>H\u01b0\u1edbng d\u1eabn n\u00e0y d\u1eabn d\u1eaft b\u1ea1n qua qu\u00e1 tr\u00ecnh thi\u1ebft k\u1ebf v\u00e0 m\u00f4 h\u00ecnh h\u00f3a m\u1ed9t<strong>H\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n cu\u1ed9c g\u1ecdi \u0111i\u1ec7n tho\u1ea1i<\/strong>s\u1eed d\u1ee5ng<strong>S\u01a1 \u0111\u1ed3 M\u00e1y tr\u1ea1ng th\u00e1i UML<\/strong>. N\u00f3 t\u1eadp trung v\u00e0o<strong>chu k\u1ef3 s\u1ed1ng cu\u1ed9c g\u1ecdi \u0111i<\/strong>, minh h\u1ecda c\u00e1ch m\u1ed9t \u0111\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n tho\u1ea1i chuy\u1ec3n \u0111\u1ed5i gi\u1eefa c\u00e1c tr\u1ea1ng th\u00e1i ph\u1ea3n \u1ee9ng v\u1edbi h\u00e0nh \u0111\u1ed9ng c\u1ee7a ng\u01b0\u1eddi d\u00f9ng v\u00e0 c\u00e1c s\u1ef1 ki\u1ec7n m\u1ea1ng.<\/p>\n<p>S\u01a1 \u0111\u1ed3 n\u00e0y ghi l\u1ea1i c\u1ea3 hai<strong>\u0111\u01b0\u1eddng \u0111i thu\u1eadn l\u1ee3i<\/strong> (thi\u1ebft l\u1eadp cu\u1ed9c g\u1ecdi th\u00e0nh c\u00f4ng) v\u00e0<strong>\u0111\u01b0\u1eddng \u0111i kh\u00f4ng thu\u1eadn l\u1ee3i<\/strong> (l\u1ed7i, h\u1ebft th\u1eddi gian ch\u1edd, \u0111\u01b0\u1eddng d\u00e2y b\u1eadn), nh\u1ea5n m\u1ea1nh t\u00ednh b\u1ec1n v\u1eefng, x\u1eed l\u00fd ngo\u1ea1i l\u1ec7 v\u00e0 c\u00e1c chuy\u1ec3n \u0111\u1ed5i tr\u1ea1ng th\u00e1i r\u00f5 r\u00e0ng \u2013 nh\u1eefng nguy\u00ean t\u1eafc c\u1ed1t l\u00f5i trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng th\u1eddi gian th\u1ef1c.<\/p>\n<hr\/>\n<h2>\ud83e\udde9 C\u00e1c kh\u00e1i ni\u1ec7m c\u1ed1t l\u00f5i trong M\u00e1y tr\u1ea1ng th\u00e1i UML<\/h2>\n<p>Tr\u01b0\u1edbc khi \u0111i s\u00e2u v\u00e0o s\u01a1 \u0111\u1ed3, h\u00e3y hi\u1ec3u c\u00e1c kh\u00e1i ni\u1ec7m UML n\u1ec1n t\u1ea3ng sau:<\/p>\n<table>\n<thead>\n<tr>\n<th>Kh\u00e1i ni\u1ec7m<\/th>\n<th>M\u00f4 t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Tr\u1ea1ng th\u00e1i<\/strong><\/td>\n<td>M\u1ed9t tr\u1ea1ng th\u00e1i trong \u0111\u00f3 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ecfa m\u00e3n c\u00e1c \u0111i\u1ec1u ki\u1ec7n nh\u1ea5t \u0111\u1ecbnh ho\u1eb7c th\u1ef1c hi\u1ec7n c\u00e1c h\u00e0nh \u0111\u1ed9ng.<\/td>\n<\/tr>\n<tr>\n<td><strong>Chuy\u1ec3n ti\u1ebfp<\/strong><\/td>\n<td>M\u1ed9t s\u1ef1 thay \u0111\u1ed5i t\u1eeb tr\u1ea1ng th\u00e1i n\u00e0y sang tr\u1ea1ng th\u00e1i kh\u00e1c, \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t b\u1edfi m\u1ed9t s\u1ef1 ki\u1ec7n.<\/td>\n<\/tr>\n<tr>\n<td><strong>S\u1ef1 ki\u1ec7n<\/strong><\/td>\n<td>M\u1ed9t s\u1ef1 ki\u1ec7n g\u00e2y ra chuy\u1ec3n ti\u1ebfp (v\u00ed d\u1ee5 nh\u01b0<code data-backticks=\"1\">onHook<\/code>,\u00a0<code data-backticks=\"1\">validNumber<\/code>).<\/td>\n<\/tr>\n<tr>\n<td><strong>Chuy\u1ec3n ti\u1ebfp t\u1ef1 th\u00e2n<\/strong><\/td>\n<td>M\u1ed9t chuy\u1ec3n ti\u1ebfp b\u1eaft \u0111\u1ea7u v\u00e0 k\u1ebft th\u00fac \u1edf c\u00f9ng m\u1ed9t tr\u1ea1ng th\u00e1i (v\u00ed d\u1ee5 nh\u01b0<code data-backticks=\"1\">ch\u1eef s\u1ed1(n)<\/code>trong khi \u1edf trong<code data-backticks=\"1\">\u0110ang g\u1ecdi<\/code>).<\/td>\n<\/tr>\n<tr>\n<td><strong>Tr\u1ea1ng th\u00e1i gi\u1ea3<\/strong><\/td>\n<td>C\u00e1c \u0111i\u1ec3m \u0111i\u1ec1u khi\u1ec3n \u0111\u1eb7c bi\u1ec7t nh\u01b0<code data-backticks=\"1\">Ban \u0111\u1ea7u<\/code>ho\u1eb7c<code data-backticks=\"1\">Cu\u1ed1i c\u00f9ng<\/code>m\u00e0 kh\u00f4ng ph\u1ea3i l\u00e0 c\u00e1c tr\u1ea1ng th\u00e1i th\u1ef1c s\u1ef1.<\/td>\n<\/tr>\n<tr>\n<td><strong>Tr\u1ea1ng th\u00e1i h\u1ee3p th\u00e0nh<\/strong><\/td>\n<td>M\u1ed9t tr\u1ea1ng th\u00e1i ch\u1ee9a c\u00e1c tr\u1ea1ng th\u00e1i con (v\u00ed d\u1ee5 nh\u01b0<code data-backticks=\"1\">L\u1ed7i<\/code>tr\u1ea1ng th\u00e1i v\u1edbi<code data-backticks=\"1\">Tone b\u1eadn<\/code>,\u00a0<code data-backticks=\"1\">Tone b\u1eadn nhanh<\/code>,\u00a0<code data-backticks=\"1\">Tin nh\u1eafn ghi \u00e2m<\/code>).<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7<\/strong><\/td>\n<td>M\u1ed9t bi\u1ec3u th\u1ee9c logic ph\u1ea3i \u0111\u00fang \u0111\u1ec3 chuy\u1ec3n ti\u1ebfp x\u1ea3y ra.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<blockquote>\n<p>\u2705\u00a0<strong>M\u1eb9o hay:<\/strong>S\u1eed d\u1ee5ng<code data-backticks=\"1\">s\u1ef1 ki\u1ec7n [\u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7] \/ h\u00e0nh \u0111\u1ed9ng<\/code>c\u00fa ph\u00e1p trong UML \u0111\u1ec3 ghi ch\u00fa c\u00e1c s\u1ef1 ki\u1ec7n k\u00edch ho\u1ea1t, \u0111i\u1ec1u ki\u1ec7n v\u00e0 t\u00e1c d\u1ee5ng ph\u1ee5.<\/p>\n<\/blockquote>\n<hr\/>\n<h2>\ud83d\udd04 Chu k\u1ef3 s\u1ed1ng cu\u1ed9c g\u1ecdi \u0111i: Ph\u00e2n t\u00edch t\u1eebng b\u01b0\u1edbc<\/h2>\n<h3>1.\u00a0<strong>Giai \u0111o\u1ea1n kh\u1edfi t\u1ea1o v\u00e0 g\u1ecdi<\/strong><\/h3>\n<h4>\ud83d\udd39 Tr\u1ea1ng th\u00e1i gi\u1ea3 ban \u0111\u1ea7u \u2192 \u0110ang ch\u1edd<\/h4>\n<ul>\n<li>\n<p>H\u1ec7 th\u1ed1ng kh\u1edfi \u0111\u1ed9ng \u1edf tr\u1ea1ng th\u00e1i\u00a0<strong>Tr\u1ea1ng th\u00e1i gi\u1ea3 ban \u0111\u1ea7u<\/strong>.<\/p>\n<\/li>\n<li>\n<p>Ch\u01b0a c\u00f3 ho\u1ea1t \u0111\u1ed9ng n\u00e0o; \u0111i\u1ec7n tho\u1ea1i \u0111ang \u0111\u1ec3 tr\u00ean gi\u00e1 \u0111\u1ee1.<\/p>\n<\/li>\n<\/ul>\n<h4>\ud83d\udd39 \u0110ang ch\u1edd \u2192 T\u00edn hi\u1ec7u ch\u1edd (\u0111i\u1ec7n tho\u1ea1i \u0111ang tr\u00ean gi\u00e1 \u0111\u1ee1)<\/h4>\n<ul>\n<li>\n<p><strong>S\u1ef1 ki\u1ec7n:<\/strong>\u00a0<code data-backticks=\"1\">\u0111i\u1ec7n tho\u1ea1i \u0111ang tr\u00ean gi\u00e1 \u0111\u1ee1<\/code>\u00a0(ng\u01b0\u1eddi d\u00f9ng nh\u1ea5c \u0111i\u1ec7n tho\u1ea1i l\u00ean)<\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n ti\u1ebfp:<\/strong>\u00a0<code data-backticks=\"1\">\u0111i\u1ec7n tho\u1ea1i \u0111ang tr\u00ean gi\u00e1 \u0111\u1ee1 \u2192 T\u00edn hi\u1ec7u ch\u1edd<\/code><\/p>\n<\/li>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng:<\/strong>\u00a0T\u1ea1o t\u00edn hi\u1ec7u ch\u1edd; chu\u1ea9n b\u1ecb cho \u0111\u1ea7u v\u00e0o ch\u1eef s\u1ed1.<\/p>\n<\/li>\n<\/ul>\n<blockquote>\n<p>\ud83d\udccc\u00a0<em>\u0110\u00e2y l\u00e0 thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i \u0111\u1ea7u ti\u00ean c\u00f3 th\u1ec3 quan s\u00e1t \u0111\u01b0\u1ee3c trong v\u00f2ng \u0111\u1eddi cu\u1ed9c g\u1ecdi.<\/em><\/p>\n<\/blockquote>\n<h4>\ud83d\udd39 T\u00edn hi\u1ec7u ch\u1edd \u2192 \u0110ang g\u1ecdi (ch\u1eef s\u1ed1(n))<\/h4>\n<ul>\n<li>\n<p><strong>S\u1ef1 ki\u1ec7n:<\/strong>\u00a0<code data-backticks=\"1\">ch\u1eef s\u1ed1(n)<\/code>\u00a0(ng\u01b0\u1eddi d\u00f9ng nh\u1eadp m\u1ed9t ch\u1eef s\u1ed1)<\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n ti\u1ebfp:<\/strong>\u00a0<code data-backticks=\"1\">ch\u1eef s\u1ed1(n) \u2192 \u0110ang g\u1ecdi<\/code><\/p>\n<\/li>\n<li>\n<p><strong>Tr\u1ea1ng th\u00e1i:<\/strong>\u00a0Chuy\u1ec3n sang\u00a0<code data-backticks=\"1\">\u0110ang g\u1ecdi<\/code>\u00a0ch\u1ebf \u0111\u1ed9.<\/p>\n<\/li>\n<\/ul>\n<h4>\ud83d\udd39 Chuy\u1ec3n ti\u1ebfp t\u1ef1 th\u00e2n: \u0110ang g\u1ecdi \u2192 \u0110ang g\u1ecdi (ch\u1eef s\u1ed1(n))<\/h4>\n<ul>\n<li>\n<p><strong>S\u1ef1 ki\u1ec7n:<\/strong>\u00a0<code data-backticks=\"1\">ch\u1eef s\u1ed1(n)<\/code>\u00a0(nh\u1eadp nhi\u1ec1u ch\u1eef s\u1ed1 li\u00ean ti\u1ebfp)<\/p>\n<\/li>\n<li>\n<p><strong>\u0110i\u1ec1u ki\u1ec7n:<\/strong>\u00a0Kh\u00f4ng (lu\u00f4n \u0111\u01b0\u1ee3c ph\u00e9p)<\/p>\n<\/li>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng:<\/strong>\u00a0Th\u00eam ch\u1eef s\u1ed1 v\u00e0o s\u1ed1 \u0111ang \u0111\u01b0\u1ee3c g\u1ecdi.<\/p>\n<\/li>\n<li>\n<p><strong>M\u1ee5c \u0111\u00edch:<\/strong>\u00a0Cho ph\u00e9p nh\u1eadp li\u00ean t\u1ee5c c\u00e1c ch\u1eef s\u1ed1 m\u00e0 kh\u00f4ng c\u1ea7n r\u1eddi kh\u1ecfi tr\u1ea1ng th\u00e1i<code data-backticks=\"1\">\u0110ang g\u1ecdi<\/code>\u00a0tr\u1ea1ng th\u00e1i.<\/p>\n<\/li>\n<\/ul>\n<blockquote>\n<p>\ud83d\udca1\u00a0<em>C\u00e1c chuy\u1ec3n ti\u1ebfp t\u1ef1 th\u00e2n l\u00e0 thi\u1ebft y\u1ebfu \u0111\u1ec3 x\u1eed l\u00fd c\u00e1c chu\u1ed7i \u0111\u1ea7u v\u00e0o nh\u01b0 s\u1ed1 \u0111i\u1ec7n tho\u1ea1i.<\/em><\/p>\n<\/blockquote>\n<hr\/>\n<h3>2.\u00a0<strong>Logic k\u1ebft n\u1ed1i v\u00e0 x\u1eed l\u00fd ngo\u1ea1i l\u1ec7<\/strong><\/h3>\n<h4>\ud83d\udd39 \u0110ang g\u1ecdi \u2192 \u0110ang k\u1ebft n\u1ed1i (s\u1ed1 h\u1ee3p l\u1ec7)<\/h4>\n<ul>\n<li>\n<p><strong>S\u1ef1 ki\u1ec7n:<\/strong>\u00a0<code data-backticks=\"1\">s\u1ed1 h\u1ee3p l\u1ec7<\/code>\u00a0(s\u1ed1 ho\u00e0n ch\u1ec9nh \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c minh)<\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n ti\u1ebfp:<\/strong>\u00a0<code data-backticks=\"1\">s\u1ed1 h\u1ee3p l\u1ec7 \u2192 \u0110ang k\u1ebft n\u1ed1i<\/code><\/p>\n<\/li>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng:<\/strong>\u00a0Kh\u1edfi t\u1ea1o thi\u1ebft l\u1eadp cu\u1ed9c g\u1ecdi v\u1edbi m\u1ea1ng l\u01b0\u1edbi.<\/p>\n<\/li>\n<\/ul>\n<h4>\ud83d\udd39 \u0110ang g\u1ecdi \u2192 Tin nh\u1eafn \u0111\u00e3 ghi (s\u1ed1 kh\u00f4ng h\u1ee3p l\u1ec7)<\/h4>\n<ul>\n<li>\n<p><strong>S\u1ef1 ki\u1ec7n:<\/strong>\u00a0<code data-backticks=\"1\">s\u1ed1 kh\u00f4ng h\u1ee3p l\u1ec7<\/code>\u00a0(v\u00ed d\u1ee5: \u0111\u1ed9 d\u00e0i sai, ti\u1ec1n t\u1ed1 kh\u00f4ng h\u1ee3p l\u1ec7)<\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n ti\u1ebfp:<\/strong>\u00a0<code data-backticks=\"1\">s\u1ed1 kh\u00f4ng h\u1ee3p l\u1ec7 \u2192 Tin nh\u1eafn \u0111\u00e3 ghi<\/code><\/p>\n<\/li>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng:<\/strong>\u00a0Ph\u00e1t tin nh\u1eafn \u0111\u00e3 ghi tr\u01b0\u1edbc:\u00a0<em>\u201cS\u1ed1 \u0111i\u1ec7n tho\u1ea1i b\u1ea1n v\u1eeba g\u1ecdi hi\u1ec7n kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng.\u201d<\/em><\/p>\n<\/li>\n<\/ul>\n<h4>\ud83d\udd39 \u0110ang k\u1ebft n\u1ed1i \u2192 T\u00edn hi\u1ec7u b\u1eadn (s\u1ed1 b\u1eadn)<\/h4>\n<ul>\n<li>\n<p><strong>S\u1ef1 ki\u1ec7n:<\/strong>\u00a0<code data-backticks=\"1\">s\u1ed1 b\u1eadn<\/code><\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n ti\u1ebfp:<\/strong>\u00a0<code data-backticks=\"1\">numberBusy \u2192 T\u00edn hi\u1ec7u b\u1eadn<\/code><\/p>\n<\/li>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng:<\/strong>\u00a0Ph\u00e1t t\u00edn hi\u1ec7u b\u1eadn; th\u00f4ng b\u00e1o cho ng\u01b0\u1eddi d\u00f9ng bi\u1ebft \u0111\u01b0\u1eddng d\u00e2y \u0111ang b\u1eadn.<\/p>\n<\/li>\n<\/ul>\n<h4>\ud83d\udd39 \u0110ang k\u1ebft n\u1ed1i \u2192 T\u00edn hi\u1ec7u b\u1eadn nhanh (trunkBusy)<\/h4>\n<ul>\n<li>\n<p><strong>S\u1ef1 ki\u1ec7n:<\/strong>\u00a0<code data-backticks=\"1\">trunkBusy<\/code><\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n ti\u1ebfp:<\/strong>\u00a0<code data-backticks=\"1\">trunkBusy \u2192 T\u00edn hi\u1ec7u b\u1eadn nhanh<\/code><\/p>\n<\/li>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng:<\/strong>\u00a0Ph\u00e1t t\u00edn hi\u1ec7u b\u1eadn nhanh; cho bi\u1ebft m\u1ea1ng \u0111ang qu\u00e1 t\u1ea3i.<\/p>\n<\/li>\n<\/ul>\n<blockquote>\n<p>\u26a0\ufe0f\u00a0<strong>Ghi ch\u00fa:<\/strong>\u00a0\u0110\u00e2y l\u00e0\u00a0<strong>tr\u1ea1ng th\u00e1i l\u1ed7i<\/strong>\u00a0l\u00e0 nh\u1eefng tr\u1ea1ng th\u00e1i l\u00e0m gi\u00e1n \u0111o\u1ea1n lu\u1ed3ng ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng. Ch\u00fang c\u1ea7n \u0111\u01b0\u1ee3c x\u1eed l\u00fd m\u1ed9t c\u00e1ch tr\u01a1n tru.<\/p>\n<\/blockquote>\n<hr\/>\n<h3>3.\u00a0<strong>C\u01a1 ch\u1ebf th\u1eddi gian ch\u1edd v\u00e0 c\u1ea3nh b\u00e1o<\/strong><\/h3>\n<h4>\ud83d\udd39 \u0110ang quay s\u1ed1 \u2192 C\u1ea3nh b\u00e1o (h\u1ebft th\u1eddi gian)<\/h4>\n<ul>\n<li>\n<p><strong>S\u1ef1 ki\u1ec7n:<\/strong>\u00a0<code data-backticks=\"1\">h\u1ebft th\u1eddi gian<\/code>\u00a0sau 30 gi\u00e2y kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng<\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n ti\u1ebfp:<\/strong>\u00a0<code data-backticks=\"1\">h\u1ebft th\u1eddi gian \u2192 C\u1ea3nh b\u00e1o<\/code><\/p>\n<\/li>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng:<\/strong>\u00a0Ph\u00e1t ti\u1ebfng b\u00edp c\u1ea3nh b\u00e1o; th\u00f4ng b\u00e1o cho ng\u01b0\u1eddi d\u00f9ng ti\u1ebfp t\u1ee5c ho\u1eb7c ng\u1eaft k\u1ebft n\u1ed1i.<\/p>\n<\/li>\n<\/ul>\n<h4>\ud83d\udd39 C\u1ea3nh b\u00e1o \u2192 H\u1ebft th\u1eddi gian (h\u1ebft th\u1eddi gian)<\/h4>\n<ul>\n<li>\n<p><strong>S\u1ef1 ki\u1ec7n:<\/strong>\u00a0<code data-backticks=\"1\">h\u1ebft th\u1eddi gian<\/code>\u00a0l\u1ea7n n\u1eefa sau 10 gi\u00e2y<\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n ti\u1ebfp:<\/strong>\u00a0<code data-backticks=\"1\">timeout \u2192 Th\u1eddi gian ch\u1edd h\u1ebft<\/code><\/p>\n<\/li>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng:<\/strong>\u00a0H\u1ee7y b\u1ecf cu\u1ed9c g\u1ecdi; quay l\u1ea1i\u00a0<code data-backticks=\"1\">Ng\u01b0ng ho\u1ea1t \u0111\u1ed9ng<\/code>.<\/p>\n<\/li>\n<\/ul>\n<blockquote>\n<p>\u23f1\ufe0f\u00a0<em>Logic th\u1eddi gian ch\u1edd ng\u0103n ch\u1eb7n vi\u1ec7c ch\u1edd \u0111\u1ee3i v\u00f4 h\u1ea1n v\u00e0 c\u1ea3i thi\u1ec7n tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng.<\/em><\/p>\n<\/blockquote>\n<hr\/>\n<h3>4.\u00a0<strong>Cu\u1ed9c g\u1ecdi \u0111ang ho\u1ea1t \u0111\u1ed9ng v\u00e0 ng\u1eaft k\u1ebft n\u1ed1i<\/strong><\/h3>\n<h4>\ud83d\udd39 \u0110ang k\u1ebft n\u1ed1i \u2192 B\u1eaft m\u00e1y (\u0111\u01b0\u1ee3c \u0111\u1ecbnh tuy\u1ebfn)<\/h4>\n<ul>\n<li>\n<p><strong>S\u1ef1 ki\u1ec7n:<\/strong>\u00a0<code data-backticks=\"1\">\u0111\u01b0\u1ee3c \u0111\u1ecbnh tuy\u1ebfn<\/code>\u00a0(m\u1ea1ng \u0111\u1ecbnh tuy\u1ebfn cu\u1ed9c g\u1ecdi th\u00e0nh c\u00f4ng)<\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n ti\u1ebfp:<\/strong>\u00a0<code data-backticks=\"1\">\u0111\u01b0\u1ee3c \u0111\u1ecbnh tuy\u1ebfn \u2192 B\u1eaft m\u00e1y<\/code><\/p>\n<\/li>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng:<\/strong>\u00a0G\u1eedi t\u00edn hi\u1ec7u b\u1eaft m\u00e1y \u0111\u1ebfn b\u00ean \u0111\u01b0\u1ee3c g\u1ecdi.<\/p>\n<\/li>\n<\/ul>\n<h4>\ud83d\udd39 B\u1eaft m\u00e1y \u2192 K\u1ebft n\u1ed1i (\u0111i\u1ec7n tho\u1ea1i \u0111\u01b0\u1ee3c g\u1ecdi tr\u1ea3 l\u1eddi)<\/h4>\n<ul>\n<li>\n<p><strong>S\u1ef1 ki\u1ec7n:<\/strong>\u00a0<code data-backticks=\"1\">\u0111i\u1ec7n tho\u1ea1i \u0111\u01b0\u1ee3c g\u1ecdi tr\u1ea3 l\u1eddi<\/code><\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n ti\u1ebfp:<\/strong>\u00a0<code data-backticks=\"1\">\u0111i\u1ec7n tho\u1ea1i \u0111\u01b0\u1ee3c g\u1ecdi tr\u1ea3 l\u1eddi \u2192 K\u1ebft n\u1ed1i<\/code><\/p>\n<\/li>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng:<\/strong>\u00a0Thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i \u00e2m thanh; b\u1eaft \u0111\u1ea7u ghi \u00e2m cu\u1ed9c g\u1ecdi (n\u1ebfu \u0111\u01b0\u1ee3c b\u1eadt).<\/p>\n<\/li>\n<\/ul>\n<h4>\ud83d\udd39 K\u1ebft n\u1ed1i \u2192 Ng\u1eaft k\u1ebft n\u1ed1i (nh\u1ea5c m\u00e1y ho\u1eb7c \u0111i\u1ec7n tho\u1ea1i \u0111\u01b0\u1ee3c g\u1ecdi ng\u1eaft k\u1ebft n\u1ed1i)<\/h4>\n<ul>\n<li>\n<p><strong>Hai con \u0111\u01b0\u1eddng \u0111\u1ec3 ng\u1eaft k\u1ebft n\u1ed1i:<\/strong><\/p>\n<ol>\n<li>\n<p><strong>Ng\u01b0\u1eddi d\u00f9ng ng\u1eaft k\u1ebft n\u1ed1i:<\/strong>\u00a0<code data-backticks=\"1\">nh\u1ea5c m\u00e1y \u2192 Ng\u1eaft k\u1ebft n\u1ed1i<\/code><\/p>\n<\/li>\n<li>\n<p><strong>\u0110\u1ed1i ph\u01b0\u01a1ng treo m\u00e1y:<\/strong>\u00a0<code data-backticks=\"1\">calledPhoneHangsUp \u2192 Ng\u1eaft k\u1ebft n\u1ed1i<\/code><\/p>\n<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<blockquote>\n<p>\ud83d\udd04\u00a0<em>C\u1ea3 hai chuy\u1ec3n ti\u1ebfp \u0111\u1ec1u d\u1eabn \u0111\u1ebfn\u00a0<code data-backticks=\"1\">Ng\u1eaft k\u1ebft n\u1ed1i<\/code>\u00a0tr\u01b0\u1edbc khi \u0111\u1ea1t \u0111\u1ebfn\u00a0<code data-backticks=\"1\">Tr\u1ea1ng th\u00e1i cu\u1ed1i<\/code>.<\/em><\/p>\n<\/blockquote>\n<h4>\ud83d\udd39 Ng\u1eaft k\u1ebft n\u1ed1i \u2192 Tr\u1ea1ng th\u00e1i cu\u1ed1i<\/h4>\n<ul>\n<li>\n<p><strong>S\u1ef1 ki\u1ec7n:<\/strong>\u00a0Kh\u00f4ng (ng\u1ea7m \u0111\u1ecbnh ho\u1eb7c th\u00f4ng qua h\u00e0nh \u0111\u1ed9ng d\u1ecdn d\u1eb9p)<\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n ti\u1ebfp:<\/strong>\u00a0<code data-backticks=\"1\">Ng\u1eaft k\u1ebft n\u1ed1i \u2192 Cu\u1ed1i<\/code><\/p>\n<\/li>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng:<\/strong>\u00a0D\u1ecdn d\u1eb9p t\u00e0i nguy\u00ean, ghi l\u1ea1i th\u1eddi l\u01b0\u1ee3ng cu\u1ed9c g\u1ecdi, c\u1eadp nh\u1eadt th\u1ed1ng k\u00ea.<\/p>\n<\/li>\n<\/ul>\n<blockquote>\n<p>\u2705\u00a0<em>Tr\u1ea1ng th\u00e1i cu\u1ed1i bi\u1ec3u th\u1ecb k\u1ebft th\u00fac chu k\u1ef3 cu\u1ed9c g\u1ecdi.<\/em><\/p>\n<\/blockquote>\n<hr\/>\n<h2>\ud83c\udfa8 Nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf tr\u1ef1c quan \u0111\u1ec3 r\u00f5 r\u00e0ng<\/h2>\n<p>\u0110\u1ec3 l\u00e0m cho c\u00e1c m\u00e1y tr\u1ea1ng th\u00e1i ph\u1ee9c t\u1ea1p d\u1ec5 \u0111\u1ecdc v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec:<\/p>\n<table>\n<thead>\n<tr>\n<th>Nguy\u00ean t\u1eafc<\/th>\n<th>Th\u1ef1c hi\u1ec7n<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>\u0110\u01b0\u1eddng \u0111i ch\u00ednh h\u1ea1nh ph\u00fac<\/strong><\/td>\n<td>Gi\u1eef lu\u1ed3ng ch\u00ednh (Ng\u01b0ng \u2192 T\u00edn hi\u1ec7u b\u1ea5m s\u1ed1 \u2192 \u0110ang b\u1ea5m s\u1ed1 \u2192 \u0110ang k\u1ebft n\u1ed1i \u2192 \u0110ang reo \u2192 \u0110\u00e3 k\u1ebft n\u1ed1i) nh\u01b0 m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u1ee9ng ho\u1eb7c ngang s\u1ea1ch s\u1ebd.<\/td>\n<\/tr>\n<tr>\n<td><strong>R\u1ebd ra ngo\u00e0i cho c\u00e1c ngo\u1ea1i l\u1ec7<\/strong><\/td>\n<td>\u0110\u1eb7t c\u00e1c tr\u1ea1ng th\u00e1i l\u1ed7i (T\u00edn hi\u1ec7u b\u1eadn, T\u00edn hi\u1ec7u b\u1eadn nhanh, Tin nh\u1eafn ghi \u00e2m) nh\u01b0 c\u00e1c nh\u00e1nh ph\u1ee5.<\/td>\n<\/tr>\n<tr>\n<td><strong>Nh\u00f3m c\u00e1c tr\u1ea1ng th\u00e1i li\u00ean quan<\/strong><\/td>\n<td>S\u1eed d\u1ee5ng\u00a0<strong>tr\u1ea1ng th\u00e1i h\u1ee3p th\u00e0nh<\/strong>\u00a0cho c\u00e1c \u0111i\u1ec1u ki\u1ec7n l\u1ed7i (xem b\u00ean d\u01b0\u1edbi).<\/td>\n<\/tr>\n<tr>\n<td><strong>S\u1eed d\u1ee5ng tr\u1ea1ng th\u00e1i gi\u1ea3 m\u1ed9t c\u00e1ch kh\u00f4n kh\u00e9o<\/strong><\/td>\n<td><code data-backticks=\"1\">Ban \u0111\u1ea7u<\/code>\u00a0v\u00e0\u00a0<code data-backticks=\"1\">Cu\u1ed1i c\u00f9ng<\/code>\u00a0ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u r\u00f5 r\u00e0ng.<\/td>\n<\/tr>\n<tr>\n<td><strong>Tr\u00e1nh c\u00e1c chuy\u1ec3n ti\u1ebfp ch\u00e9o nhau<\/strong><\/td>\n<td>Gi\u1eef cho c\u00e1c m\u0169i t\u00ean kh\u00f4ng ch\u1ed3ng ch\u00e9o l\u00ean nhau; s\u1eed d\u1ee5ng c\u00e1c v\u00f9ng vu\u00f4ng g\u00f3c n\u1ebfu c\u1ea7n thi\u1ebft.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr\/>\n<h2>\ud83d\udd27 C\u00e1c k\u1ef9 thu\u1eadt m\u00f4 h\u00ecnh h\u00f3a n\u00e2ng cao<\/h2>\n<h3>\u2705 Tr\u1ea1ng th\u00e1i t\u1ed5ng h\u1ee3p: Nh\u00f3m \u201cL\u1ed7i\u201d<\/h3>\n<p>Thay v\u00ec li\u1ec7t k\u00ea\u00a0<code data-backticks=\"1\">BusyTone<\/code>,\u00a0<code data-backticks=\"1\">FastBusyTone<\/code>, v\u00e0\u00a0<code data-backticks=\"1\">RecordedMessage<\/code>\u00a0nh\u01b0 c\u00e1c tr\u1ea1ng th\u00e1i ri\u00eang bi\u1ec7t, h\u00e3y nh\u00f3m ch\u00fang d\u01b0\u1edbi m\u1ed9t\u00a0<strong>tr\u1ea1ng th\u00e1i t\u1ed5ng h\u1ee3p<\/strong>\u00a0g\u1ecdi l\u00e0\u00a0<code data-backticks=\"1\">L\u1ed7i<\/code>:<\/p>\n<pre class=\"lang-plaintext\"><code data-language=\"plaintext\">[L\u1ed7i] \r\n\u251c\u2500\u2500 BusyTone\r\n\u251c\u2500\u2500 FastBusyTone\r\n\u2514\u2500\u2500 RecordedMessage\r\n<\/code><\/pre>\n<ul>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng v\u00e0o:<\/strong>\u00a0Ph\u00e1t \u00e2m thanh l\u1ed7i ho\u1eb7c tin nh\u1eafn.<\/p>\n<\/li>\n<li>\n<p><strong>H\u00e0nh \u0111\u1ed9ng tho\u00e1t:<\/strong>\u00a0Tr\u1edf v\u1ec1\u00a0<code data-backticks=\"1\">DialTone<\/code>\u00a0ho\u1eb7c\u00a0<code data-backticks=\"1\">Idle<\/code>\u00a0sau ph\u1ea3n h\u1ed3i c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/p>\n<\/li>\n<\/ul>\n<blockquote>\n<p>\u2705\u00a0<strong>L\u1ee3i \u00edch:<\/strong>Gi\u1ea3m s\u1ef1 l\u1ed9n x\u1ed9n v\u1ec1 m\u1eb7t th\u1ecb gi\u00e1c v\u00e0 c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng.<\/p>\n<\/blockquote>\n<hr\/>\n<h3>\u2705 \u0110i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 (t\u0103ng c\u01b0\u1eddng t\u00f9y ch\u1ecdn)<\/h3>\n<p>Th\u00eam \u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 \u0111\u1ec3 tinh ch\u1ec9nh c\u00e1c chuy\u1ec3n ti\u1ebfp:<\/p>\n<pre class=\"lang-plaintext\"><code data-language=\"plaintext\">digit(n) [number.length &lt; 15] \u2192 \u0110ang g\u1ecdi\r\n<\/code><\/pre>\n<pre class=\"lang-plaintext\"><code data-language=\"plaintext\">validNumber [number.isInternational] \u2192 \u0110ang k\u1ebft n\u1ed1i\r\n<\/code><\/pre>\n<blockquote>\n<p>\ud83d\udee0\ufe0f \u0110i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7 ng\u0103n ch\u1eb7n c\u00e1c chuy\u1ec3n ti\u1ebfp kh\u00f4ng h\u1ee3p l\u1ec7 v\u00e0 h\u1ed7 tr\u1ee3 logic \u0111i\u1ec1u ki\u1ec7n.<\/p>\n<\/blockquote>\n<hr\/>\n<h2>\ud83d\udccc Nh\u1eefng \u0111i\u1ec3m ch\u00ednh c\u1ea7n l\u01b0u \u00fd: C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho m\u00e1y tr\u1ea1ng th\u00e1i ph\u1ee9c t\u1ea1p<\/h2>\n<table>\n<thead>\n<tr>\n<th>Th\u1ef1c h\u00e0nh<\/th>\n<th>T\u1ea1i sao \u0111i\u1ec1u \u0111\u00f3 quan tr\u1ecdng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>M\u00f4 h\u00ecnh h\u00f3a c\u00e1c \u0111\u01b0\u1eddng \u0111i kh\u00f4ng mong mu\u1ed1n<\/strong><\/td>\n<td>C\u00e1c h\u1ec7 th\u1ed1ng th\u1ef1c t\u1ebf c\u00f3 th\u1ec3 th\u1ea5t b\u1ea1i. Thi\u1ebft k\u1ebf cho\u00a0<code data-backticks=\"1\">s\u1ed1 kh\u00f4ng h\u1ee3p l\u1ec7<\/code>,\u00a0<code data-backticks=\"1\">h\u1ebft th\u1eddi gian ch\u1edd<\/code>,\u00a0<code data-backticks=\"1\">k\u00eanh b\u1eadn<\/code>\u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady.<\/td>\n<\/tr>\n<tr>\n<td><strong>S\u1eed d\u1ee5ng bi\u1ec3u th\u1ee9c h\u00e0nh \u0111\u1ed9ng<\/strong><\/td>\n<td>Bao g\u1ed3m\u00a0<code data-backticks=\"1\">\/ logCallAttempt()<\/code>\u00a0ho\u1eb7c\u00a0<code data-backticks=\"1\">\/ playTone()<\/code>\u00a0\u0111\u1ec3 hi\u1ec3n th\u1ecb c\u00e1c hi\u1ec7u \u1ee9ng ph\u1ee5.<\/td>\n<\/tr>\n<tr>\n<td><strong>Gi\u1eef c\u00e1c s\u1ef1 ki\u1ec7n r\u00f5 r\u00e0ng v\u00e0 h\u01b0\u1edbng \u0111\u1ebfn h\u00e0nh \u0111\u1ed9ng<\/strong><\/td>\n<td>S\u1eed d\u1ee5ng\u00a0<code data-backticks=\"1\">treo m\u00e1y<\/code>,\u00a0<code data-backticks=\"1\">\u0111\u01b0\u1ee3c \u0111\u1ecbnh tuy\u1ebfn<\/code>,\u00a0<code data-backticks=\"1\">\u0111i\u1ec7n tho\u1ea1i \u0111\u01b0\u1ee3c g\u1ecdi \u0111\u00e3 tr\u1ea3 l\u1eddi<\/code>thay v\u00ec<code data-backticks=\"1\">e1<\/code>,\u00a0<code data-backticks=\"1\">e2<\/code>.<\/td>\n<\/tr>\n<tr>\n<td><strong>\u0110\u1eb7t t\u00ean tr\u1ea1ng th\u00e1i m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng<\/strong><\/td>\n<td>Tr\u00e1nh<code data-backticks=\"1\">Tr\u1ea1ng th\u00e1i1<\/code>,\u00a0<code data-backticks=\"1\">Tr\u1ea1ng th\u00e1i2<\/code>. S\u1eed d\u1ee5ng<code data-backticks=\"1\">\u0110ang g\u1ecdi<\/code>,\u00a0<code data-backticks=\"1\">\u0110ang reo<\/code>,\u00a0<code data-backticks=\"1\">\u0110\u00e3 k\u1ebft n\u1ed1i<\/code>.<\/td>\n<\/tr>\n<tr>\n<td><strong>T\u00e0i li\u1ec7u c\u00e1c gi\u1ea3 \u0111\u1ecbnh<\/strong><\/td>\n<td>V\u00ed d\u1ee5: \u201cH\u1ebft th\u1eddi gian sau 30 gi\u00e2y kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng\u201d c\u1ea7n \u0111\u01b0\u1ee3c ghi ch\u00fa trong ph\u1ea7n ch\u00fa th\u00edch.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr\/>\n<h2><img decoding=\"async\" src=\"https:\/\/uml.planttext.com\/plantuml\/png\/VPDDJyCm38RlbVeVh5tua2Rk710mXk00GjiG1yGXQxms8dMc90LDYF-EaovRobShLOdzs77jD-VE2-kxLfT5U9-FNs0yFeDRgR4imZTkhvJG2qC8fs3enfZNijYPabzHpMwfQkKFwQW7WkrtFy01p56lm5j1JdbbQ1WoCKHO-JxgZUtolckNQ8VK32jZ9SexT4xKeJv5Vy9FmbAVpwiMJUVB8fc2Uz4RStTMH3oD5tq2oswKFu3BpcssVQ9OG33yeAw5yndfRKUlFPWEo1g0af5AQ8toeU602tBlQDqkAVlx3hig2qXJ-XVAiju8gjtZElGhGq9CK0IZ6WLrwo0H5en764sjDNO4ma5SpQFreoo0dosI_Z5IQJCWyav4AZSCo6-3Zl0tMrbyXleEu9OyMX8QH1LqvRP2FWKaRpTmma9G7bR6WbcjnirGpdlgGOiDwvNp-5ZDNiI9c1XkOELxKRl1dFVGB4Wbzde_tymRjXPRmyowYUVaWq_ObDkmrCerCH4u_kFjZHbCDE4BjAsYqBWTMHRdI98l-XS0\"\/><\/p>\n<p>\ud83d\udcbb T\u1ea1o m\u00e3: PlantUML &amp; Mermaid<\/p>\n<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0<strong>c\u00e1c kh\u1ed1i m\u00e3 s\u1eb5n s\u00e0ng s\u1eed d\u1ee5ng<\/strong>\u0111\u1ec3 t\u1ea1o s\u01a1 \u0111\u1ed3 n\u00e0y theo \u0111\u1ecbnh d\u1ea1ng b\u1ea1n mong mu\u1ed1n.<\/p>\n<hr\/>\n<h3>\u2705 M\u00e3 PlantUML<\/h3>\n<pre class=\"lang-plantuml\"><code data-language=\"plantuml\"><\/code><\/pre>\n<p>@startuml<\/p>\n<p>[*] \u2013&gt; \u0110ang ch\u1edd<br \/>\n\u0110ang ch\u1edd \u2013&gt; T\u00edn hi\u1ec7u g\u1ecdi : treo m\u00e1y<br \/>\nT\u00edn hi\u1ec7u g\u1ecdi \u2013&gt; \u0110ang g\u1ecdi : nh\u1ea5n s\u1ed1(n)<br \/>\n\u0110ang g\u1ecdi \u2013&gt; \u0110ang g\u1ecdi : nh\u1ea5n s\u1ed1(n) \u2018 Chuy\u1ec3n ti\u1ebfp t\u1ef1 th\u00e2n<br \/>\n\u0110ang g\u1ecdi \u2013&gt; \u0110ang k\u1ebft n\u1ed1i : s\u1ed1 h\u1ee3p l\u1ec7<br \/>\n\u0110ang g\u1ecdi \u2013&gt; Tin nh\u1eafn \u0111\u00e3 ghi : s\u1ed1 kh\u00f4ng h\u1ee3p l\u1ec7<br \/>\n\u0110ang g\u1ecdi \u2013&gt; C\u1ea3nh b\u00e1o : h\u1ebft th\u1eddi gian<br \/>\nC\u1ea3nh b\u00e1o \u2013&gt; H\u1ebft th\u1eddi gian : h\u1ebft th\u1eddi gian<br \/>\n\u0110ang k\u1ebft n\u1ed1i \u2013&gt; \u0110ang reo chu\u00f4ng : \u0111\u00e3 \u0111\u1ecbnh tuy\u1ebfn<br \/>\n\u0110ang k\u1ebft n\u1ed1i \u2013&gt; T\u00edn hi\u1ec7u b\u1eadn : s\u1ed1 b\u1eadn<br \/>\n\u0110ang k\u1ebft n\u1ed1i \u2013&gt; T\u00edn hi\u1ec7u b\u1eadn nhanh : \u0111\u01b0\u1eddng tr\u1ee5c b\u1eadn<br \/>\n\u0110ang reo chu\u00f4ng \u2013&gt; \u0110\u00e3 k\u1ebft n\u1ed1i : \u0111i\u1ec7n tho\u1ea1i ng\u01b0\u1eddi g\u1ecdi \u0111\u00e3 tr\u1ea3 l\u1eddi<br \/>\n\u0110\u00e3 k\u1ebft n\u1ed1i \u2013&gt; Ng\u1eaft k\u1ebft n\u1ed1i : treo m\u00e1y<br \/>\n\u0110\u00e3 k\u1ebft n\u1ed1i \u2013&gt; Ng\u1eaft k\u1ebft n\u1ed1i : \u0111i\u1ec7n tho\u1ea1i ng\u01b0\u1eddi g\u1ecdi treo m\u00e1y<br \/>\nNg\u1eaft k\u1ebft n\u1ed1i \u2013&gt; [*] : d\u1ecdn d\u1eb9p<\/p>\n<pre class=\"lang-plantuml\"><code data-language=\"plantuml\"><\/code><\/pre>\n<pre class=\"lang-plantuml\"><code data-language=\"plantuml\"><\/code><\/pre>\n<p>tr\u1ea1ng th\u00e1i \u201cL\u1ed7i\u201d l\u00e0 ErrorState {<br \/>\ntr\u1ea1ng th\u00e1i \u201cT\u00edn hi\u1ec7u b\u1eadn\u201d l\u00e0 BusyTone<br \/>\ntr\u1ea1ng th\u00e1i \u201cT\u00edn hi\u1ec7u b\u1eadn nhanh\u201d l\u00e0 FastBusyTone<br \/>\ntr\u1ea1ng th\u00e1i \u201cTin nh\u1eafn \u0111\u00e3 ghi\u201d l\u00e0 RecordedMessage<br \/>\n}<\/p>\n<pre class=\"lang-plantuml\"><code data-language=\"plantuml\"><\/code><\/pre>\n<p>\u2018 C\u00e1c h\u00e0nh \u0111\u1ed9ng n\u1ed9i b\u1ed9<br \/>\nNg\u01b0ng ho\u1ea1t \u0111\u1ed9ng : nh\u1eadp \/ Ch\u1edd treo m\u00e1y<br \/>\nT\u00edn hi\u1ec7u b\u1ea5m s\u1ed1 : nh\u1eadp \/ Ph\u00e1t t\u00edn hi\u1ec7u b\u1ea5m s\u1ed1<br \/>\n\u0110ang g\u1ecdi : nh\u1eadp \/ Thu th\u1eadp c\u00e1c ch\u1eef s\u1ed1<br \/>\n\u0110ang k\u1ebft n\u1ed1i : nh\u1eadp \/ \u0110\u1ecbnh tuy\u1ebfn cu\u1ed9c g\u1ecdi<br \/>\n\u0110ang reo chu\u00f4ng : nh\u1eadp \/ G\u1ecdi chu\u00f4ng \u0111i\u1ec7n tho\u1ea1i xa<br \/>\n\u0110\u00e3 k\u1ebft n\u1ed1i : nh\u1eadp \/ Thi\u1ebft l\u1eadp phi\u00ean g\u1ecdi<br \/>\nNg\u1eaft k\u1ebft n\u1ed1i : nh\u1eadp \/ K\u1ebft th\u00fac phi\u00ean<\/p>\n<pre class=\"lang-plantuml\"><code data-language=\"plantuml\"><\/code><\/pre>\n<p>@enduml<code data-language=\"plantuml\"><br \/>\n<\/code><\/p>\n<blockquote>\n<p>\ud83d\udce5\u00a0<strong>C\u00e1ch s\u1eed d\u1ee5ng:<\/strong>\u00a0D\u00e1n v\u00e0o\u00a0<a href=\"https:\/\/www.plantuml.com\/plantuml\/\">PlantUML Live<\/a>\u00a0ho\u1eb7c ti\u1ec7n \u00edch cho IDE c\u1ee7a b\u1ea1n.<\/p>\n<\/blockquote>\n<hr\/>\n<h3>\u2705 M\u00e3 Mermaid<\/h3>\n<p id=\"YeinSps\"><img alt=\"\" class=\"alignnone size-full wp-image-174\" decoding=\"async\" height=\"867\" loading=\"lazy\" sizes=\"auto, (max-width: 1335px) 100vw, 1335px\" src=\"https:\/\/www.go-minder.com\/wp-content\/uploads\/2026\/03\/img_69aea11e8f25e.png\" srcset=\"https:\/\/www.go-minder.com\/wp-content\/uploads\/2026\/03\/img_69aea11e8f25e.png 1335w, https:\/\/www.go-minder.com\/wp-content\/uploads\/2026\/03\/img_69aea11e8f25e-300x195.png 300w, https:\/\/www.go-minder.com\/wp-content\/uploads\/2026\/03\/img_69aea11e8f25e-1024x665.png 1024w, https:\/\/www.go-minder.com\/wp-content\/uploads\/2026\/03\/img_69aea11e8f25e-768x499.png 768w\" width=\"1335\"\/><\/p>\n<pre class=\"lang-mermaid\"><code data-language=\"mermaid\">stateDiagram-v2\r\n    [*] --&gt; Idle\r\n    Idle --&gt; DialTone : onHook\r\n\r\n    DialTone --&gt; Dialing : digit(n)\r\n    Dialing --&gt; Dialing : digit(n)  ' Chuy\u1ec3n ti\u1ebfp t\u1ef1 th\u00e2n\r\n    Dialing --&gt; Connecting : validNumber\r\n    Dialing --&gt; RecordedMessage : invalidNumber\r\n    Dialing --&gt; Warning : timeout\r\n\r\n    Warning --&gt; Timeout : timeout\r\n\r\n    Connecting --&gt; Ringing : routed\r\n    Connecting --&gt; BusyTone : numberBusy\r\n    Connecting --&gt; FastBusyTone : trunkBusy\r\n\r\n    Ringing --&gt; Connected : calledPhoneAnswers\r\n    Connected --&gt; Disconnected : onHook\r\n    Connected --&gt; Disconnected : calledPhoneHangsUp\r\n\r\n    Disconnected --&gt; [*] : cleanup\r\n\r\n    state Error {\r\n        BusyTone\r\n        FastBusyTone\r\n        RecordedMessage\r\n    }\r\n\r\n    Connecting --&gt; BusyTone : numberBusy\r\n    Connecting --&gt; FastBusyTone : trunkBusy\r\n    Dialing --&gt; RecordedMessage : invalidNumber\r\n\r\n    note right of BusyTone\r\n        Ph\u00e1t \u00e2m thanh b\u1eadn ti\u00eau chu\u1ea9n\r\n    end note\r\n\r\n    note right of FastBusyTone\r\n        Ph\u00e1t \u00e2m thanh b\u1eadn nhanh (m\u1ea1ng qu\u00e1 t\u1ea3i)\r\n    end note\r\n\r\n    note right of RecordedMessage\r\n        Ph\u00e1t th\u00f4ng b\u00e1o ghi \u00e2m: \"S\u1ed1 \u0111i\u1ec7n tho\u1ea1i kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng.\"\r\n    end note\r\n\r\n    note right of Timeout\r\n        Cu\u1ed9c g\u1ecdi b\u1ecb h\u1ee7y sau 40 gi\u00e2y\r\n    end note\r\n<\/code><\/pre>\n<blockquote>\n<p>\ud83d\udce5\u00a0<strong>C\u00e1ch s\u1eed d\u1ee5ng:<\/strong>\u00a0D\u00e1n v\u00e0o\u00a0<a href=\"https:\/\/mermaid.live\/edit\">Tr\u00ecnh ch\u1ec9nh s\u1eeda Mermaid tr\u1ef1c tuy\u1ebfn<\/a>\u00a0ho\u1eb7c c\u00e1c c\u00f4ng c\u1ee5 Markdown \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 (VS Code, Obsidian, v.v.).<\/p>\n<\/blockquote>\n<hr\/>\n<h2>\ud83d\udcda T\u00f3m t\u1eaft v\u00e0 suy ngh\u0129 cu\u1ed1i c\u00f9ng<\/h2>\n<p>\u0110\u00e2y l\u00e0<strong>H\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n cu\u1ed9c g\u1ecdi \u0111i\u1ec7n tho\u1ea1i<\/strong>\u00a0m\u00e1y tr\u1ea1ng th\u00e1i l\u00e0 m\u1ed9t<strong>v\u00ed d\u1ee5 th\u1ef1c t\u1ebf<\/strong>\u00a0v\u1ec1 c\u00e1ch UML c\u00f3 th\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p, d\u1ef1a tr\u00ean s\u1ef1 ki\u1ec7n v\u1edbi \u0111\u1ed9 tin c\u1eady cao.<\/p>\n<h3>\u2705 \u0110i\u1ec1u g\u00ec khi\u1ebfn s\u01a1 \u0111\u1ed3 n\u00e0y hi\u1ec7u qu\u1ea3:<\/h3>\n<ul>\n<li>\n<p>R\u00f5 r\u00e0ng\u00a0<strong>\u0111\u01b0\u1eddng \u0111i ch\u00ednh<\/strong>\u00a0v\u1edbi lu\u1ed3ng logic r\u00f5 r\u00e0ng.<\/p>\n<\/li>\n<li>\n<p>X\u1eed l\u00fd l\u1ed7i to\u00e0n di\u1ec7n\u00a0<strong>x\u1eed l\u00fd l\u1ed7i<\/strong>.<\/p>\n<\/li>\n<li>\n<p>S\u1eed d\u1ee5ng\u00a0<strong>chuy\u1ec3n ti\u1ebfp t\u1ef1 th\u00e2n<\/strong>,\u00a0<strong>tr\u1ea1ng th\u00e1i h\u1ee3p th\u00e0nh<\/strong>, v\u00e0\u00a0<strong>\u0111i\u1ec1u ki\u1ec7n b\u1ea3o v\u1ec7<\/strong>.<\/p>\n<\/li>\n<li>\n<p>\u0110\u1ed9 r\u00f5 r\u00e0ng tr\u1ef1c quan nh\u1edd\u00a0<strong>s\u1eafp x\u1ebfp nh\u00f3m<\/strong>\u00a0v\u00e0\u00a0<strong>ghi ch\u00fa<\/strong>.<\/p>\n<\/li>\n<\/ul>\n<h3>\ud83d\udee0\ufe0f Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng m\u1eabu n\u00e0y:<\/h3>\n<ul>\n<li>\n<p>H\u1ec7 th\u1ed1ng \u0111i\u1ec7n tho\u1ea1i<\/p>\n<\/li>\n<li>\n<p>\u0110i\u1ec1u khi\u1ec3n thi\u1ebft b\u1ecb IoT<\/p>\n<\/li>\n<li>\n<p>Qu\u1ea3n l\u00fd phi\u00ean ng\u01b0\u1eddi d\u00f9ng<\/p>\n<\/li>\n<li>\n<p>C\u00e1c b\u1ed9 \u0111\u1ed9ng l\u1ef1c c\u00f4ng vi\u1ec7c<\/p>\n<\/li>\n<li>\n<p>H\u1ec7 th\u1ed1ng nh\u00fang v\u1edbi logic tr\u1ea1ng th\u00e1i h\u1eefu h\u1ea1n<\/p>\n<\/li>\n<\/ul>\n<hr\/>\n<h2>\ud83d\udcdd Mu\u1ed1n m\u1edf r\u1ed9ng th\u00eam?<\/h2>\n<p>Xem x\u00e9t th\u00eam:<\/p>\n<ul>\n<li>\n<p><strong>Ghi \u00e2m cu\u1ed9c g\u1ecdi<\/strong>\u00a0tr\u1ea1ng th\u00e1i (v\u1edbi\u00a0<code data-backticks=\"1\">b\u1eaft \u0111\u1ea7u ghi \u00e2m<\/code>,\u00a0<code data-backticks=\"1\">d\u1eebng ghi \u00e2m<\/code>\u00a0s\u1ef1 ki\u1ec7n)<\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n cu\u1ed9c g\u1ecdi<\/strong>\u00a0logic (\u0111i\u1ec1u h\u01b0\u1edbng \u0111i\u1ec1u ki\u1ec7n)<\/p>\n<\/li>\n<li>\n<p><strong>Ch\u1edd cu\u1ed9c g\u1ecdi<\/strong>\u00a0h\u1ed7 tr\u1ee3 (tr\u1ea1ng th\u00e1i song song)<\/p>\n<\/li>\n<li>\n<p><strong>Chuy\u1ec3n cu\u1ed9c g\u1ecdi<\/strong>\u00a0l\u00e0 tr\u1ea1ng th\u00e1i con c\u1ee7a\u00a0<code data-backticks=\"1\">K\u1ebft n\u1ed1i<\/code><\/p>\n<\/li>\n<li>\n<p><strong>L\u1ecbch s\u1eed tr\u1ea1ng th\u00e1i<\/strong>\u00a0(l\u1ecbch s\u1eed n\u00f4ng\/s\u00e2u) \u0111\u1ec3 t\u00e1i nh\u1eadp sau khi b\u1ecb gi\u00e1n \u0111o\u1ea1n<\/p>\n<\/li>\n<\/ul>\n<hr\/>\n<h2>\ud83d\udccc \u0110\u1ec1 xu\u1ea5t cu\u1ed1i c\u00f9ng<\/h2>\n<blockquote>\n<p><strong>Lu\u00f4n m\u00f4 h\u00ecnh h\u00f3a c\u1ea3 c\u00e1c \u0111\u01b0\u1eddng \u0111i th\u00e0nh c\u00f4ng v\u00e0 th\u1ea5t b\u1ea1i.<\/strong><br \/>\nM\u1ed9t m\u00e1y tr\u1ea1ng th\u00e1i ch\u1ec9 x\u1eed l\u00fd c\u00e1c \u0111\u01b0\u1eddng \u0111i &#8216;thu\u1eadn l\u1ee3i&#8217; l\u00e0 ch\u01b0a ho\u00e0n ch\u1ec9nh v\u00e0 d\u1ec5 g\u1eb7p l\u1ed7i trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t.<\/p>\n<\/blockquote>\n<p>S\u1eed d\u1ee5ng h\u01b0\u1edbng d\u1eabn n\u00e0y nh\u01b0 m\u1ed9t\u00a0<strong>m\u1eabu<\/strong>\u00a0\u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a b\u1ea5t k\u1ef3 h\u1ec7 th\u1ed1ng th\u1eddi gian th\u1ef1c n\u00e0o n\u01a1i\u00a0<strong>chuy\u1ec3n \u0111\u1ed5i tr\u1ea1ng th\u00e1i<\/strong>,\u00a0<strong>s\u1ef1 ki\u1ec7n<\/strong>, v\u00e0\u00a0<strong>kh\u1ea3 n\u0103ng ch\u1ecbu l\u1ed7i<\/strong>\u00a0quan tr\u1ecdng.<\/p>\n<hr\/>\n<p>\u2705\u00a0<strong>S\u1eb5n s\u00e0ng \u0111\u1ec3 t\u1ea1o, tr\u1ef1c quan h\u00f3a ho\u1eb7c m\u1edf r\u1ed9ng?<\/strong><br \/>\n\ud83d\udc49 Sao ch\u00e9p m\u00e3\u00a0<strong>PlantUML<\/strong>\u00a0ho\u1eb7c\u00a0<strong>Mermaid<\/strong>\u00a0m\u00e3 ph\u00eda tr\u00ean v\u00e0 t\u00edch h\u1ee3p n\u00f3 v\u00e0o t\u00e0i li\u1ec7u, s\u01a1 \u0111\u1ed3 ki\u1ebfn tr\u00fac ho\u1eb7c t\u00e0i li\u1ec7u thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n.<\/p>\n<p>H\u00e3y cho t\u00f4i bi\u1ebft n\u1ebfu b\u1ea1n mu\u1ed1n m\u1ed9t\u00a0<strong>phi\u00ean b\u1ea3n PDF<\/strong>,\u00a0<strong>s\u01a1 \u0111\u1ed3 t\u01b0\u01a1ng t\u00e1c<\/strong>, ho\u1eb7c\u00a0<strong>t\u00edch h\u1ee3p v\u00e0o m\u00f4 h\u00ecnh h\u1ec7 th\u1ed1ng l\u1edbn h\u01a1n (v\u00ed d\u1ee5: v\u1edbi c\u00e1c th\u00e0nh ph\u1ea7n ho\u1eb7c s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1)<\/strong>!<\/p>\n<hr\/>\n<p class=\"\">\ud83d\udcd8\u00a0<em>\u201cNh\u1eefng h\u1ec7 th\u1ed1ng t\u1ed1t nh\u1ea5t kh\u00f4ng ch\u1ec9 ch\u00ednh x\u00e1c\u2014ch\u00fang d\u1ef1 \u0111o\u00e1n tr\u01b0\u1edbc s\u1ef1 th\u1ea5t b\u1ea1i.\u201d<\/em><br \/>\n\u2014\u00a0<em>Thi\u1ebft k\u1ebf v\u1edbi m\u00e1y tr\u1ea1ng th\u00e1i UML<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ud83c\udfaf T\u1ed5ng quan H\u01b0\u1edbng d\u1eabn n\u00e0y d\u1eabn d\u1eaft b\u1ea1n qua qu\u00e1 tr\u00ecnh thi\u1ebft k\u1ebf v\u00e0 m\u00f4 h\u00ecnh h\u00f3a m\u1ed9tH\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n cu\u1ed9c g\u1ecdi \u0111i\u1ec7n tho\u1ea1is\u1eed d\u1ee5ngS\u01a1 \u0111\u1ed3 M\u00e1y tr\u1ea1ng&hellip;<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","inline_featured_image":false,"fifu_image_url":"https:\/\/uml.planttext.com\/plantuml\/png\/VPDDJyCm38RlbVeVh5tua2Rk710mXk00GjiG1yGXQxms8dMc90LDYF-EaovRobShLOdzs77jD-VE2-kxLfT5U9-FNs0yFeDRgR4imZTkhvJG2qC8fs3enfZNijYPabzHpMwfQkKFwQW7WkrtFy01p56lm5j1JdbbQ1WoCKHO-JxgZUtolckNQ8VK32jZ9SexT4xKeJv5Vy9FmbAVpwiMJUVB8fc2Uz4RStTMH3oD5tq2oswKFu3BpcssVQ9OG33yeAw5yndfRKUlFPWEo1g0af5AQ8toeU602tBlQDqkAVlx3hig2qXJ-XVAiju8gjtZElGhGq9CK0IZ6WLrwo0H5en764sjDNO4ma5SpQFreoo0dosI_Z5IQJCWyav4AZSCo6-3Zl0tMrbyXleEu9OyMX8QH1LqvRP2FWKaRpTmma9G7bR6WbcjnirGpdlgGOiDwvNp-5ZDNiI9c1XkOELxKRl1dFVGB4Wbzde_tymRjXPRmyowYUVaWq_ObDkmrCerCH4u_kFjZHbCDE4BjAsYqBWTMHRdI98l-XS0","fifu_image_alt":"","footnotes":""},"categories":[13,15,44],"tags":[],"class_list":["post-239","post","type-post","status-publish","format-standard","hentry","category-ai","category-ai-chatbot","category-uml"],"yoast_head":"<!-- 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