Unable to register Polycom phones on fresh FreePBX 16

FreePBX Endpoints
1

We have some VVX411 phones and even an SPIP7000 that are on our current PBX that I’m trying to move over to FreePBX after the current system soft-failed on us.

When one of the Polycom phones registers, it immediately becomes unavailable:

[2023-11-27 17:48:53] VERBOSE[13865] res_pjsip_registrar.c: Added contact 'sip:<ext#>@<phoneip>:5060' to AOR '<ext#>' with expiration of 60 seconds
[2023-11-27 17:48:56] VERBOSE[13865] res_pjsip/pjsip_options.c: Contact <ext#>/sip:<ext#>@<phoneip>:5060 is now Unreachable.  RTT: 0.000 msec

These are the only phones having this issue; our YeaLink and other devices register just fine.

The phones are on a different subnet across a site-to-site VPN from the PBX, but there’s no NAT involved. We are allowing all SIP and ICMP traffic to the PBX.

Any ideas?

2

Under each extension (assuming your using pjsip), set Aggregate MWI = yes under Advanced tab

3

I just tried that, but this seems to be unrelated to registration; I see no improvement in the behavior.

4

The default is much longer, possibly 3600 seconds. Did you set a short expiry because of this problem? If not, there is a SIP ALG in the path that is likely also causing your issue.

At the Asterisk command prompt, type
pjsip set logger on
The Asterisk log will now include a SIP trace. You can see whether OPTIONS was sent correctly and whether a corrupted reply was received. Also, capture with Wireshark at the remote end to see whether the VPN connection is dropping or altering any of these packets. If you don’t have a smart switch there to mirror the packets, see

5

Yes, I wanted to test with a short expiry so I changed it to 60.

I’ll turn the logger on and see what I can find out.

6

Turns out there were a few things set up that were affecting this; adding the subnet to the “local networks” in SIP settings seemed to resolve the registration issue, and I later found out that someone had set up a provisioning server on one of the networks as well so that was fun.

7

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