anupjose02
I was searching and found that in Zoper help page, that inorder to auto answer call from server side following code needs to be placed in extension.conf file.
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)
will become:
exten => 100,1,SIPAddHeader(Call-Info:<sip:>\;answer-after=0)
exten => 100,n,Dial(SIP/kbell)
The syntax might differ if you are not using Asterisk.
https://www.zoiper.com/en/support/answer/for/windows/60/Auto_Answer