I was trying to make the new Outbound MWI Subscription feature work and have so far not been able to. My Asterisk server sends the SUBSCRIBE message and my VoIP provider returns with a 403 Forbidden message. But instead of responding with the authentication, my Asterisk server retransmits the original message six times.
Here’s a trace: pastebin.ca/1881202
I noticed when my Asterisk box attempts to register, the from header looks like this:
but, when my Asterisk box attempts to subscribe, the header looks like this:
Not sure if this is significant or a red herring.
Nothing is behind NAT.
Thanks if anyone can help,