![]() Inband means that DTMF is transmitted in the same network connection as the audio of the phone conversation. ![]() A typical application where you’d want control of the duration of the keypress is controlling an electric door opener. ![]() This is a tricky issue: You cannot expect to have control over the duration of DTMF signals when using SIP INFO in general, or RFC2833 before Asterisk 1.4.0: For example, cell phone carriers transmit keys pressed on your GSM phone to fixed length signals regardless of how long you pressed that key. Receiving one DTMF digit on Zap (PRI Sangoma E1) in Asterisk 1.4Īs a PBX Asterisk is able to translate the different types of DTMF signaling methods (audio, RFC2833, SIP INFO, IAX2).Catch DTMF when 2 users are in conversation.Changing DTMF tone frequency in Asterisk.Changing DTMF duration when sending for ZAP channels.
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