View source for Listen in (SIP)

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Turbine stations has a  "Listen in" feature in SIP mode. 

If the station receives “X-Zenitel-Audio: listener” in a SIP INVITE message it means that the call will not be visible in the station and that audio is only sent from the station, not played out on the speaker.<br>
The audio sent from the station is microphone audio without echo cancellation, therefore any speaker audio caught by the microphone is included.<br><br>
The station supports one "listen in call" at a time and any new "listen in calls" will be rejected.. The station can operate normally while someone is listening, for example making a new outgoing/incoming call is possible.<br><br>

'''Asterisk configuration example. (extensions.conf):'''
 exten => 905,1,SIPAddHeader(X-Zenitel-Audio: listener)
 exten => 905,2,Dial(SIP/211)

'''Example Listen in SIP INVITE:<br>'''
[[File:SIP-listen-in-INVITE.png]]

'''Listen-In currently supports only G.711 and G.722. G.729 is not supported'''

[[Category: SIP intercom - Configuration]]