We use GS Wave and it has the ability to auto-answer intercom calls. Is there such a capability with Zoiper? Turning on auto-answer makes it answer all calls, which isn't what we want.
Zoiper supports server-side auto-answer.
In that case the server sends special header towards the UA when the call should be answered automatically.
To send an accept request to Zoiper, you need to add the auto-answer header in the extensions.conf of your Asterisk.Example:
exten => 100,1,Dial(SIP/kbell)
exten => 100,1,SIPAddHeader(Call-Info:<sip:>\;answer-after=0)exten => 100,n,Dial(SIP/kbell)