For most phone models no direct control is supported. These must be configured as [Secial Device] = "Standard". The call setup is made via "Originate" command of the Asterisk Manager Interface. |
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Free hand mode via Call-Info : Answer-After=0 |
Some SIP-phones supports auto-answer via INVITE SIP-Header. Examples:- Call-Info: Answer-After=0
- Alert-Info: ;info=alert-autoanswer
- Alert-Info: <sip:>;info=alert-autoanswer
- Alert-Info: <sip:domain>;info=alert-autoanswer
domain = Asterisk IP-Address
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See also:- www.voip-info.org/wiki/view/Asterisk+Paging+and+Intercom
- snom phones: In Snom-Web configuration, set the "Intercom Policy" option to "always" or "only in idle" under [Advanced > Behavior]. See also:answer_after_policy
- Yealink: In the Yealink web configuration, you have to activate "Enable Intercom" under [Features > Intercom].
- Grandstream:
- Grandstream 2135: In the Grandstream web configuration, the option "Allow Auto Answer by Call-Info/Alert Info" should be set to "Yes" under [Account X > Call Settings].
- Grandstream 3240: In the Grandstream web configuration, set the option "AutoAnswer" to "Enable Intercom/Paging" in [Account X > Call Settings].
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CTI-Answer via SIP-NOTIFY |
Requirements:- This option requires special adjustments in the telephone system that the manufacturer of the system would have to make.
- The SIP-SoftPhone or the SIP-telephone responds to special NOTIFY events with parameter "Event: CtiAnswer".
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Functionality: When the TAPI driver receives a lineAnswer command via TAPI, it sends a special Action "Redirect". The system would then have to generate a special NOTIFY event with the parameter "Event CtiAnswer". The SIP-SoftPhone or the SIP-telephone then answers the incoming call.
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