408 Request Timeout and 504 Server Time-out Errors

Cantatus.Systems.Group

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Hi there,

Today we encountered an issue with our phone system; upon checking the event logs we saw the following errors:

Code:
Call or Registration to 6045358964@(Ln.10001@Patton Analog FXO) has failed. 192.168.1.251 replied: 504 Server Time-out; from IP:192.168.1.251:5060
SIP Server ID: 12294 02/14/2025 2:13:16 PM
Call or Registration to 16045358964@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 2:13:05 PM
Call or Registration to 6045358964@(Ln.10001@Patton Analog FXO) has failed. 192.168.1.251 replied: 504 Server Time-out; from IP:192.168.1.251:5060
SIP Server ID: 12294 02/14/2025 2:11:53 PM
Call or Registration to 16045358964@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 2:11:42 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 2:10:19 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 2:09:01 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 2:08:24 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 2:07:48 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 2:07:11 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 2:06:34 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 2:05:49 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 2:04:50 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 2:02:02 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 2:00:54 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 1:58:36 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 1:57:57 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 1:57:18 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 1:56:42 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 1:56:05 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 1:55:29 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 1:54:52 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 1:54:04 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 1:52:14 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 1:51:04 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 1:50:11 PM
Call or Registration to 18884445308@(Ln.10000@ThinkTel) has failed. 0.0.0.0 replied: 408 Request Timeout; internal
SIP Server ID: 12294 02/14/2025 1:49:24 PM

However, we can successfully ping the IP address 192.168.1.251 from the 3CX server. We also tried restarting the 3CX server.

We contacted our SIP Trunk provider for assistance, who said "It appears that your PBX is failing to respond to our Options request and is not establishing a connection."

Unfortunately, we are stuck and are not able to determine the root cause. Could anybody please help point us in the right direction? Thanks for your assistance!
 

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