IP phone 1 is registered to the Cisco CallManager publisher and calls to the plain switched telephone network (PSTN). The Cisco CallManager picks up H323 PSTN GW 1 as the primary gateway due to the device pool setting to route the call out from the Cisco CallManager subscriber through the H.323. These calls drop intermittently during mid-call and when the call is dropped, the IP phone displays a Temp Fail error message.
The Temp Fail message appears when the phones unregister from the Cisco CallManager server to which they connect. This can be caused by network issues that prevent the phones to connect to their Cisco CallManager server or maybe the box they register to went down and the phones failed over to the next server. Application Log of the Event Viewer on the Cisco CallManager server the phones are registered to show some related errors.
This is a sample trace captured on this issue:
The Cisco CallManager instructed the IP phone to drop the call:
If traces show similar symtoms as previously shown, then:
Check the network path between the Subscriber and Publisher Cisco CallManager Servers.
Check the switch ports on which the Cisco CallManager Server is connected.
If you receive errors on switch ports, change the NIC setting on the server. If the NIC port speed is hardcoded to 100/Full, change it to 100/Auto. This can help clean the error, which is mostly caused due to port setting mismatch.
When no errors are seen on switchport of the switch, the SDLLINK out-of-service message should no longer be reported, and the call drops so the issue should be resolved.
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