SipOkToAnswerCall

This event informs application software that it is permissible to go off hook in order to answer an incoming phone call. To answer an incoming phone call, application software should execute the GoOffHook API procedure. Also, an internal “call answer timeout” timer is started when this event is sent to the application software.

The telephony engine internally uses a 60 second time out to allow applications software to answer the call. If application software does not answer the call in this 60 second period, the telephony engine will ignore the incoming phone call and reset the phone line. In this case, the call that is not answered is lost. You can change the call answer timeout value by calling the SetCallAnswerTimeout API procedure.

If application software intends to answer incoming phone calls, it must detect this event.