Overview

When using Yealink IP phones, you may encounter an issue where the Caller Name (CNAM) is not displayed on the Caller Line Identification (CLID) field. This problem typically arises when the phone's configuration is not set to prioritize the appropriate SIP headers that contain the CNAM information.

Solution

To resolve this issue, you need to include a specific parameter in the phone's configuration:

voIpProt.SIP.CID.sourcePreference="From,P-Asserted-Identity,Remote-Party-ID"

Here's how to configure it:

Refer to the Yealink guide 'Calling/Connected Line Identification Presentation on Yealink IP Phones' for detailed steps.

Explanation of the parameter:

• From: This header contains the originating caller's display name and number.
• P-Asserted-Identity: This header is used for asserting the identity of the caller within trusted networks.
• Remote-Party-ID: An alternative header used by some service providers for indicating the calling party's information.

By setting the voIpProt.SIP.CID.sourcePreference parameter, the phone will prioritize these headers to retrieve and display the CNAM information correctly.

Summary

This configuration ensures that the Yealink IP phone can properly display the caller's name as intended, utilizing the correct SIP headers.

FAQ

Q: What is the CNAM?
A: CNAM stands for Caller Name. It is the name that is displayed when you receive a call.

Q: What is the purpose of the SIP headers?
A: SIP headers contain information about the call, including the caller's name and number. They are used to ensure the correct display of this information on your phone.

Q: What if the CNAM is still not displayed after the configuration?
A: If the CNAM is still not displayed after the configuration, it may be due to issues with your service provider. Contact them for further assistance.