Some PBXs send a DTMF tone (usually tone 'D') to indicate end of call.ĭialogic drivers come pre-programmed with sets tones that they will detect as 'end-of-call' tones, but can also be be configured for what disconnect tones to listen for.ĭetermining the Disconnect tone frequency and cadence : This tone is known as a 'disconnect tone'. (but if 'timeout' or 'fail' paths are defined in current module then those paths will be taken instead).Ī tone is usually played on the line when the other party hangs up. When there is no response (keypresses etc.) from the caller within a certain time then VoiceGuide will hangup the call Loop current drop is used by some telephone companies and PBXs to indicate end of call.ĭialogic cards can detect loop current drop and VoiceGuide will immediately hang up the call when loop current drop occurs. Note that some VoIP providers may not send the 'Disconnected'/'Bye' message. VoiceGuide will then end the script and hangup as well.

This is the most reliable way of obtaining end of call indication, and is usually received immediately when remote party hangs up. VoIP and ISDN systems can use digital signalling to immediately indicate end of call when the other party hangs up the handset. Special DTMF tone played by PBX/Switch. On systems using Traditional Analog Lines end of call is detectable by: On systems using VoIP - SIP or T1/E1 ISDN end of call is detectable by:

Dtmf meaning