We have a few phones connecting to our Asterisk over the internet. These phones are able to call extensions in the office with success - we can hear the ring, answer and talk both ways. However, we are unable to dial their extensions from internal - they do not get a ring and cannot answer.
We have other phones at other internet locations connecting just fine. It must be a firewall issue at the Peer’s end, right? If I look at SIP peers, I see odd ports in use.
Bad phone over internet is this:
442/442 XX.XX.XX.XXX D N A 1025 OK (187 ms)
Good phone over internet is this:
450/450 XX.XX.XX.XXX D N A 55056 OK (189 ms)
Internal phone is this:
433/433 XX.XX.XX.XXX D N A 5060 OK (36 ms)
A good phone internally shows port 5060 and not 1025. However, the good phone at another internet location has port 55056 and it works fine.
Any suggestions? I have the RTP port range in the 10000 range too. These all seem out of that range.