Automatic Call Pickup - Using Alert Info Header - Siemens OpenStage Asterisk Installation And Maintenance Manual

Example: OpenStage operates in MAA mode.
Further information can be found at:
http://wiki.siemens-enterprise.com/images/a/a3/White_Paper_MAA.pdf
Automatic Call Answering Using Alert-Info Header
Besides using uaCSTA, the phone can be set to automatically answer a call by adding an alert
info header to the call. Thus, the SIP server is enabled to control whether a call is to be
answered immediately and without user interaction. However, the user has the possibility to
allow or disallow this feature by setting User Pages > Configuration > Incoming calls > CTI
calls > Auto answer.
The Alert-Info header must be set as follows:
Alert-Info: http://www.example.com;info=alert-autoanswer
Open Communications Principles and Best Practices 19/03/2012, page 13