[Asterisk-Dev] UK Caller ID and cable company PSTN lines

[Conroy, Lawrence (SMTP)]

Hi David,
   you have my sympathies. For telephony, the UK falls into BT and that 
patchwork
of franchises known as cable providers.

If you really truely need to get Caller ID in the UK into Asterisk, 
then your best
bet is to dump the Comedians and to get a phone line from BT 
(distasteful though
that is). You're half way there with the X100P - do not try this with 
the later and
greater cards, as they don't play with CDS and I'm not holding my 
breath.

However, if you want to try this out with your local Cable Provider 
(allegedly),
then IIRC there are two main systems that were used in those franchises 
where
they did provide Caller Display/CLI.
Some of those cable franchises that do provide CLI do it U.S. style - 
thus
if you're in one of these franchises, *and* they haven't upgraded their 
Exchange,
then the plain vanilla (i.e. Yankee) version of * should work.

If it doesn't, then...

You may be in one of other the franchises where they tried for a common 
"cable
standard" which was, I believe, to use Bellcore concepts, but to use 
V.23 instead
of 202 to signal the data (thus guaranteeing that it was incompatible 
with the rest
of the Universe). This is going to involve part of the "UK callerid" 
hack to set up
detection using v.23.
You can leave out the history buffer stuff, as the Yankee approach is 
for data to
arrive after the first ring; thus the zap channel doesn't need to look 
at what has
already happened (by peeking at the history buffer).

Non-trivial, but doable with bits of the existing UK callerid patches. 
Good Luck.

   Lawrence


On 9 Aug 2004, at 19:56, David Gurr wrote:

> I have a phone line from UK cable company NTL. Whilst I can receive 
> callerid
> just fine on a Panasonic DECT phone attached to the NTL line, I can't
> receive any callerid info with an Asterisk system attached. I'm 
> attaching to
> the line using an X100P.
>
> I'm using the latest CVS version of Asterisk and the Zaptel driver, 
> with the
> UK callerid patches applied.
>
> With the relevant debugging turned on, I can see that Asterisk is 
> looking
> for UK-style callerid, but it's just not finding it.
>
> Reading the pages the wiki links to for further reading on UK 
> callerid, I
> see that the UK cable companies use a slightly different standard to 
> BT ...
> it seems this involves using *either* the BT V.23 tones *or* the US 
> Bell 202
> tones, and that they're sent after a short first ring (unlike the BT 
> tones
> which are sent before the first ring).
>
> Before I start hacking around, has anyone else done any work on this?
>
> Thanks
>
> --
> David Gurr
> Congruity Ltd.
> Hemel Hempstead, UK
>
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