Analog DID caller ID?

Unanswered Question
Jun 9th, 2009


I am using multiple Cisco 28XX gateways that terminate analog DID lines at both FXS-DID cards and EVM interfaces. No incoming caller ID is available anywhere on calls coming from the PSTN.

Cisco's documentation is vague on this topic - do FXS-DID interfaces actually support incoming Caller ID? Is there even any such thing on an analog DID trunk?

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Paolo Bevilacqua Tue, 06/09/2009 - 10:51

There is no such thing as CLID on analog DID trunks. Recommend you get ISDN BRI or PRI that will give you both things and more.

jagdbs Wed, 06/10/2009 - 11:40

I have never seen Caller ID supported in the analog version of DID. Yes, you can get Caller ID on the digital versions, such as T1 or PRI, but not on pure analog. It might be avialble, but I have never seen it in my 20 yrs.

CLID has been available on analog for many years, however, old PBXs often times did not have the necessary software/line cards to support the features. I'm glad others are finding the data now, too. We have successfully configured CLID on CAS T1s, but again, the interdigit and wink timers took serious tracing to determine the correct settings. I'm not an expert in the IOS, but there is information available in the command reference guides (at least for T1 CAS) if you are able to verify the provisioning with your service provider

dspiewak2634 Wed, 06/10/2009 - 11:46

OK, I've learned more, so here it is for the sake of any idle curiosity that's out there.

Caller ID over analog DID is indeed possible, and a few telcos actually provide it. It's basically appended to the incoming DID digits, and separated by a delimiter digit (* for example). It's VERY non-standard, however, and the timing and intelligence required to interpret it makes it prohibitive for most manufacturers to make equipment that supports it - Cisco included.

Thanks to all of you for helping me out with this bizarre topic.

kemurdock Thu, 06/11/2009 - 15:01

I was told by the local telco that caller id was not availible on I inbound analog trunks

Paolo Bevilacqua Thu, 06/11/2009 - 20:09

Read the post above that explains how it can be made available using a non-standard method by local agreement.


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