![]() The normal values defined are: #define AST_MIN_DTMF_DURATION 80 The related code can be found at main/channel.c. Using this constants Asterisk can decide to ignore a DTMF or to regenerate a DTMF tone with a greater duration than the original. In a lot of cases this solutions include adapting the Asterisk code.Īsterisk implementation problems (for DTMFs exchange):Īsterisk defines minimal DTMF tone duration and minimal amount of time between two consecutive DTMFs tones. The goal of this article is trying to expose some problems we can encounter connecting this kind of devices to Asterisk and if applicable the solutions we can use. In a lot of scenarios Asterisk can be a great "bridge" server to connect this kind of appliances, but in some cases we can find some weakness/problems related with Asterisk implementation or with VoIP. ![]() Alarms, Tele care devices and other industrial appliances, use DTMF tones based protocol for controlling the communication or for transmit information. ![]()
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