Phone Does Not Register; Signed Configuration Files Are Not Requested; Audio Problems; No Speech Path - Cisco 7800 Series Administration Manual

Cisco IP Phone Troubleshooting
If you created a new CTL file with a new TFTP record, the existing CTL file on the phone may not contain
a record for the new TFTP server.
Solution
Check the configuration of the TFTP address in the phone CTL file.

Phone Does Not Register

Problem
Phone does not register with Cisco Unified Communications Manager.
Cause
The CTL file does not contain the correct information for the Cisco Unified Communications Manager server.
Solution
Change the Cisco Unified Communications Manager server information in the CTL file.

Signed Configuration Files Are Not Requested

Problem
Phone does not request signed configuration files.
Cause
The CTL file does not contain any TFTP entries with certificates.
Solution
Configure TFTP entries with certificates in the CTL file.

Audio Problems

The following sections describe how to resolve audio problems.

No Speech Path

Problem
One or more people on a call do not hear any audio.
Solution
When at least one person in a call does not receive audio, IP connectivity between phones is not established.
Check the configuration of routers and switches to ensure that IP connectivity is properly configured.
Cisco IP Phone 7800 Series Administration Guide for Cisco Unified Communications Manager
Phone Does Not Register
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