My Asterisk Server version is 18.104.22.168 .
When I make a phone call to another IPPBX via SIP trunk, it repiled me " 500 Internal Server Error" and hanged up when answered.
The another IPPBX asked me to allow “UPDATE” in my SIP INVITE header!!
Does anybody knows how to enable SIP UPDATE METHOD (RFC3311) feature in Asterisk,
or how to allow “UPDATE” when SIP INVITE ?
Or just refer me the docs or some code to recompile my asterisk.
Please, I need your help !