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

[Doug McIntyre]

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.