I’m having a small problem with supporting incoming calls from other SIP platforms. I’m doing some interoperability tests between them.
When 6891@SER.domain gets 403 Forbidden.
If I make a call from email@example.com, everything is OK.
Any hint of how to force Asterisk to look also at the @SER.domain in the INVITE and understand that the 6891 is just a coincidence?