Fusion PBX - one extension can't register any devices.

P

PGG

New Member
May 5, 2026
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Hi All,

I have a new FusionPBX installation running in a VM on Debian 13.

There are around 20 extensions configured, along with the same number of devices (Yealink SIP-T74U phones). Everything is working correctly except for one extension: 208.

This extension will not register any device. The same device can be assigned to a different extension and registers without any issues, but extension 208 will not register on any device. The phone simply shows “No Service”.

I have already tried the following:

  • Deleting and recreating the extension
  • Registering the device with a different extension number first, then changing it back to 208
  • Exporting/importing the extension configuration and modifying it manually
None of these steps helped.

No matter what I do, whenever I create extension 208, no device can register to it.

I had a similar issue with extension 202 a couple of weeks ago. At the time, I restored the VM from backup, which resolved it, but I did not have time to investigate the root cause. I would now like to understand what is causing this issue in case it happens again in the future.

Has anyone experienced something similar or knows what could be causing it?
 
There are two sets of logs attached. The first was captured when the device was assigned to extension 210, which registers successfully. The second was captured when the same device was assigned to extension 208, which fails to register.

In both cases, the initial response to the REGISTER request is 401 Unauthorized.

However, the response to the second REGISTER request differs: extension 210 receives a 200 OK, while extension 208 receives a 403 Forbidden.

I have already verified the credentials, deleted and recreated both extensions, and tested again, but the issue persists. Extension 208 is still unable to register on any device.

Code: 
recv 583 bytes from tcp/[192.168.0.23]:11799 at 12:51:12.769279:
------------------------------------------------------------------------
REGISTER sip:192.168.0.212:5060 SIP/2.0
Via: SIP/2.0/TCP 192.168.0.23:11799;branch=z9hG4bK783976954;rport
From: "Adam-210" <sip:210@192.168.0.212:5060>;tag=783829106
To: "Adam-210" <sip:210@192.168.0.212:5060>
Call-ID: 0_783880804@192.168.0.23
CSeq: 1 REGISTER
Contact: <sip:210@192.168.0.23:11799;transport=TCP>
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
Max-Forwards: 70
User-Agent: Yealink SIP-T74U 185.87.0.35
Expires: 120
Allow-Events: talk,hold,conference,refer,check-sync
Content-Length: 0


send 577 bytes to tcp/[192.168.0.23]:11799 at 12:51:12.769878:
------------------------------------------------------------------------
SIP/2.0 401 Unauthorized
Via: SIP/2.0/TCP 192.168.0.23:11799;branch=z9hG4bK783976954;rport=11799
From: "Adam-210" <sip:210@192.168.0.212:5060>;tag=783829106
To: "Adam-210" <sip:210@192.168.0.212:5060>;tag=DUe6Bat7y8FvN
Call-ID: 0_783880804@192.168.0.23
CSeq: 1 REGISTER
User-Agent: FreeSWITCH
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
Supported: path, replaces
WWW-Authenticate: Digest realm="192.168.0.212", nonce="3695d6a0-fd9a-4334-a022-f7d8cca6cdbe", algorithm=MD5, qop="auth"
Content-Length: 0


recv 823 bytes from tcp/[192.168.0.23]:11799 at 12:51:12.775976:
------------------------------------------------------------------------
REGISTER sip:192.168.0.212:5060 SIP/2.0
Via: SIP/2.0/TCP 192.168.0.23:11799;branch=z9hG4bK784032300;rport
From: "Adam-210" <sip:210@192.168.0.212:5060>;tag=783829106
To: "Adam-210" <sip:210@192.168.0.212:5060>
Call-ID: 0_783880804@192.168.0.23
CSeq: 2 REGISTER
Contact: <sip:210@192.168.0.23:11799;transport=TCP>
Authorization: Digest username="210", realm="192.168.0.212", nonce="3695d6a0-fd9a-4334-a022-f7d8cca6cdbe", uri="sip:192.168.0.212:5060", response="813e053c16a6f9b2fb3492ebb3658909", algorithm=MD5, cnonce="784117416", qop=auth, nc=00000001
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
Max-Forwards: 70
User-Agent: Yealink SIP-T74U 185.87.0.35
Expires: 120
Allow-Events: talk,hold,conference,refer,check-sync
Content-Length: 0


send 548 bytes to tcp/[192.168.0.23]:11799 at 12:51:12.779706:
------------------------------------------------------------------------
SIP/2.0 200 OK
Via: SIP/2.0/TCP 192.168.0.23:11799;branch=z9hG4bK784032300;rport=11799
From: "Adam-210" <sip:210@192.168.0.212:5060>;tag=783829106
To: "Adam-210" <sip:210@192.168.0.212:5060>;tag=e47yD5aBvH6eH
Call-ID: 0_783880804@192.168.0.23
CSeq: 2 REGISTER
Contact: <sip:210@192.168.0.23:11799;transport=TCP>;expires=120
Date: Tue, 02 Jun 2026 11:51:12 GMT
User-Agent: FreeSWITCH
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
Supported: path, replaces
Content-Length: 0



Code: 
recv 593 bytes from tcp/[192.168.0.23]:11799 at 12:46:43.171036:
------------------------------------------------------------------------
REGISTER sip:192.168.0.212:5060 SIP/2.0
Via: SIP/2.0/TCP 192.168.0.23:11799;branch=z9hG4bK780437698;rport
From: "Adam-208" <sip:208@192.168.0.212:5060>;tag=780280349
To: "Adam-208" <sip:208@192.168.0.212:5060>
Call-ID: 0_780388765@192.168.0.23
CSeq: 1 REGISTER
Contact: <sip:208@192.168.0.23:11799;transport=TCP>
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
Max-Forwards: 70
User-Agent: Yealink SIP-T74U 185.87.0.35
Expires: 120
Allow-Events: talk,hold,conference,refer,check-sync
Content-Length: 0


send 587 bytes to tcp/[192.168.0.23]:11799 at 12:46:43.171647:
------------------------------------------------------------------------
SIP/2.0 401 Unauthorized
Via: SIP/2.0/TCP 192.168.0.23:11799;branch=z9hG4bK780437698;rport=11799
From: "Adam-208" <sip:208@192.168.0.212:5060>;tag=780280349
To: "Adam-208" <sip:208@192.168.0.212:5060>;tag=Um328Uy44KUja
Call-ID: 0_780388765@192.168.0.23
CSeq: 1 REGISTER
User-Agent: FreeSWITCH
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
Supported: path, replaces
WWW-Authenticate: Digest realm="192.168.0.212", nonce="3e1bfbb1-08aa-47c2-881e-910c0d3eed8e", algorithm=MD5, qop="auth"
Content-Length: 0


recv 833 bytes from tcp/[192.168.0.23]:11799 at 12:46:43.177567:
------------------------------------------------------------------------
REGISTER sip:192.168.0.212:5060 SIP/2.0
Via: SIP/2.0/TCP 192.168.0.23:11799;branch=z9hG4bK780483081;rport
From: "Adam-208" <sip:208@192.168.0.212:5060>;tag=780280349
To: "Adam-208" <sip:208@192.168.0.212:5060>
Call-ID: 0_780388765@192.168.0.23
CSeq: 2 REGISTER
Contact: <sip:208@192.168.0.23:11799;transport=TCP>
Authorization: Digest username="208", realm="192.168.0.212", nonce="3e1bfbb1-08aa-47c2-881e-910c0d3eed8e", uri="sip:192.168.0.212:5060", response="05ec01189b84a3479634694a53c295fd", algorithm=MD5, cnonce="780540498", qop=auth, nc=00000001
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
Max-Forwards: 70
User-Agent: Yealink SIP-T74U 185.87.0.35
Expires: 120
Allow-Events: talk,hold,conference,refer,check-sync
Content-Length: 0


send 463 bytes to tcp/[192.168.0.23]:11799 at 12:46:43.180162:
------------------------------------------------------------------------
SIP/2.0 403 Forbidden
Via: SIP/2.0/TCP 192.168.0.23:11799;branch=z9hG4bK780483081;rport=11799
From: "Adam-208" <sip:208@192.168.0.212:5060>;tag=780280349
To: "Adam-208" <sip:208@192.168.0.212:5060>;tag=vXvUaQF81vH5N
Call-ID: 0_780388765@192.168.0.23
CSeq: 2 REGISTER
User-Agent: FreeSWITCH
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
Supported: path, replaces
Content-Length: 0
 
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