Showing results for 
Search instead for 
Did you mean: 

Caller ID on PSTN FXO line with UC540


I have a UC540 with an analogue PSTN line with caller ID activated on that line.

When I use a standard fixed telephone on the above PSTN line, I can see the number of the person who is calling me (Caller ID).

When I connect the same analogue PSTN line on my UC540, I always get 'anonimous'. I can't see the caller's number.

How can I fix this because the caller ID is important to me. On internet, I read that there are two protocols (DTMF and FSK) for caller ID on PSTN lines, but I can't find which protocol the Cisco UC540 is using. I have looked into the settings of the FXO ports on the Cisco UC540, but I can't find any information.

Can anybody help me?

PS: I'm from Belgium (Europe).

3 Replies 3

paolo bevilacqua
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

The protocol is automatically selected depending of the cptone configured under voice-port.

Add these lines to the voice port

voice-port 0/1/0

     caller-id enable

     caller-id alerting line-reversal

     caller-id alerting dsp-pre-allocate

I had this issue with analogue line connected to my FXO port and the above resolved it.

Hope this helps you.

I found this gem to fix my caller-id issue.

Works like a charm.

I am using a GSM gateway and I only needed to add.

translation-profile incoming 4000

Thanks dude!

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Recognize Your Peers