[cisco-voip] caller-id is audible on fxs

[chris]

Thank you wes that gives me more to go on I will read the link and play
with it more
On Jun 1, 2012 8:10 AM, "Wes Sisk" <wsisk at cisco.com> wrote:

> interesting that there is an audible artifact. the CLID is passed as
> 2400(?) baud signal from the FXS port or ATA to the analog phone. There
> were a few ways of doing that. Some of the more common were "type1" and
> "type2".  I believe the signaling method is also dependent on the cptone as
> an indication of the geographic region. Is an appropriate cptone selected?
> You can also configure when CLID is transmitted:
>
> http://www.cisco.com/en/US/docs/ios/12_1t/12_1t3/feature/guide/dt_clid.html#wp1049232
>
> after that it might be helpful to review the output of 'debug vpm signal'.
> IIRC this shows complete information on what is signaled out of the analog
> port. It is possible the audible artifact is due to some other feature,
> such as a misconfigured cptone, rather than being the CLID information.
>  Generally that is indeed inaudible.
>
> Regards,
> Wes
>
> On Jun 1, 2012, at 7:30 AM, chris wrote:
>
> I understand what you're saying the part I guess I don't grasp is if I
> connect an ATA to the same phone I can get caller id on the phone but even
> if I pickup before caller-id is sent I do not hear those tones.
> I tested on grandstream and linksys ATA's that I had lying around. I'm
> just trying to understand what the ATA's could be doing differently than
> the cisco FXS port that makes it work but not audible. I'm not sure if the
> ATA's are making the volume lower/higher so I'm not hearing it or something
> like that? I understand the caller id from the trunk to the ATA would use
> digital signaling through sip but once it gets to the ATA it would be doing
> the same thing as the cisco's fxs port?
>
> thanks for your help
>
> On Thu, May 31, 2012 at 11:52 PM, Doug McIntyre <merlyn at geeks.org> wrote:
>
>> On Thu, May 31, 2012 at 10:43:45PM -0400, chris wrote:
>> > heres my config id like to have which works but if i pickup before ring
>> 2 i
>> > hear what i think is the caller-id in the audio
>>
>> Indeed. That is exactly how CallerID is transmitted on analog POTS
>> phone lines. Between rings 1 & 2, Bell 202 modem modulation transmits
>> the the 10 digit calling number and possibly the name to the receiving
>> set.
>>
>> > im kind of baffled by this and feel like im missing something
>> obvious.....
>> > i mean the feature works but why in the world do i hear it?
>>
>> Why wouldn't you hear it? It is analog FSK tones? There's not a lot of
>> options for signalling on analog POTS trunks. Thats one indirect
>> reason so many other ways have been designed ties and trunks.
>>
>> > is there some way i can adjust it to not be audible or change caller-id
>> to
>> > be send before first ring or something like that? anything that keeps it
>> > working but not audible would work.....
>>
>> Use digital stations?  You must be real quick on the answer, as there
>> are zillions of analog POTS users using landlines with the same thing
>> and nobody is usually quick enough to answer the phone after ring 1 to
>> hear it.
>>
>> Otherwise, it is what it is. There isn't any change that can be done
>> to the caller ID protocol over analog lines after all these years..
>>
>> With the VoIP phone, you'll get the info transmitted out-of-band.
>>
>>
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