Server: Asterisk 1.8
Phone: Polycom 331 firmware 3.3.4
This install has been running perfectly for months. This past Monday this problem started happening:
Randomly, when Asterisk sends an INVITE to a Polycom, it will not be able to answer the call
Attached is a packet dump from during the problem.
And this is completely random. Sometimes you can call this same phone and it can answer the call, other times it cant.. (and the result is in the packet dump)
Any and all help greatly appreciated!
The attachment is really a plain text file, so rename it to .txt after downloading. (For some reason you can't upload txt files!)
only had a quick look at this as we do not provide free support via the Polycom community but your SIP server or network is not sending back the ACK required for a SIP Basic Call Flow as outlined => here <=
I would suggest you investigate this within your network or server as this is not a phone issue.
Thanks for the reply!
Yes... I am aware that the ACK is missing. But it seems very strange that it wouldn't be a phone issue, because it seems the only packet that does not get received by the server is the ACK.
the server sends the ACK and not the other way round. Look at your own trace, the phone keeps re-sending the 200 OK to the server but the server never replies.
Without the ACK no call will be established.