One specific extension in FusionPBX cannot register any device.

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
 
More logs, just before "403 FORBIDDEN"

tport.c:3055 tport_deliver() tport_deliver(0x7ff5d4008f90): msg 0x7ff5d408ae80 (837 bytes) from tcp/192.168.0.23:11799/sip next=(nil)
nta.c:2968 agent_recv_request() nta: received REGISTER sip:192.168.0.212:5060 SIP/2.0 (CSeq 2) (load: 1 rps)
nta.c:3175 agent_recv_request() nta: REGISTER (2) going to a default leg
nua_server.c:102 nua_stack_process_request() nua: nua_stack_process_request: entering
nua_stack.c:938 nh_create() nua: nh_create: entering
nua_common.c:108 nh_create_handle() nua: nh_create_handle: entering
nua_params.c:486 nua_stack_set_params() nua: nua_stack_set_params: entering
soa.c:278 soa_clone() soa_clone(static::0x7ff5d4001bf0, 0x7ff5d40013e0, 0x7ff5d4015c70) called
soa.c:402 soa_set_params() soa_set_params(static::0x7ff5d4003c10, ...) called
nua_dialog.c:338 nua_dialog_usage_add() nua(0x7ff5d4015c70): adding registrar usage
tport.c:4191 tport_pend() tport_pend(0x7ff5d4008f90): pending (nil) for tcp/192.168.0.23:11799 (already 0)
nua_stack.c:301 nua_stack_event() nua(0x7ff5d4015c70): event i_register 100 Trying
tport.c:2316 tport_set_secondary_timer() tport(0x7ff5d4008f90): reset timer
nua_stack.c:389 nua_application_event() nua: nua_application_event: entering
nua.c:1170 nua_handle_unref_user() nua nua_handle_unref_user(0x7ff5d4015c70): entering
nua_stack.c:558 nua_signal() nua(0x7ff5d4015c70): sent signal r_handle_unref
nua.c:1157 nua_unref_user() nua: nua_unref_user: entering
nua_stack.c:558 nua_signal() nua((nil)): sent signal r_unref
nua.c:365 nua_handle_magic() nua: nua_handle_magic: entering
nua_stack.c:599 nua_stack_signal() nua(0x7ff5d4015c70): recv signal r_handle_unref
nua_stack.c:599 nua_stack_signal() nua((nil)): recv signal r_unref
nua.c:878 nua_respond() nua: nua_respond: entering
nua_stack.c:601 nua_stack_signal() nua(0x7ff5d4015c70): recv signal r_respond 403 Forbidden
nua_params.c:486 nua_stack_set_params() nua: nua_stack_set_params: entering
soa.c:402 soa_set_params() soa_set_params(static::0x7ff5d4003c10, ...) called
tport.c:3290 tport_tsend() tport_tsend(0x7ff5d4008f90) tpn = TCP/192.168.0.23:11799
nua_stack.c:558 nua_signal() nua(0x7ff5d4015c70): sent signal r_respond
tport.c:3625 tport_vsend() tport_vsend(0x7ff5d4008f90): 466 bytes of 466 to tcp/192.168.0.23:11799
tport.c:3526 tport_send_msg() tport_vsend returned 466
send 466 bytes to tcp/[192.168.0.23]:11799 at 09:37:04.344568:
 
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