[Asterisk-Dev] Support for DTMF style callerid signalling

[Armand A. Verstappen]

Hi, 

I sent the message below a few days back to the user list, I did not get
much feedback there. Probably because not too many users are bitten by
this particular issue.
I would appreciate an answer to the following:

- Is anyone planning on implementing support for DTMF style CLIP?
- If not, could someone help me find the proper spot and method to
  implement this?

Thanks,

Armand.

-----Forwarded Message-----

> From: Armand A. Verstappen <armand at nl.envida.net>
> To: asterisk-users at lists.digium.com
> Subject: Re: [Asterisk-Users] anyone with X100P & Callerid working outside US ?
> Date: 22 Jul 2003 02:54:34 +0200
> 
> On Mon, 2003-07-21 at 19:25, Martin Pycko wrote:
> > I'm just curious if anyone has the X100P & Callerid receiving working
> > outside US.
> 
> It does not work in the Netherlands. The Netherlands does not use FSK
> signalling, but DTMF signalling:
> 
> 1) polarity reversal
> 2) DTMF: <D><Number><C>
> 3) ring signal
> 
> where <D> and <C> are the DTMF tones 'D' and 'C' respectively,
> signalling start and end of DTMF Caller-ID transfer.
> 
> Exact specification (including length of tones and pauses) is in this
> document:
> http://www.kpn.com/common/downloads/01_Part2-PSTN_V32.pdf
> 
> paragraph 6.2.3.
> 
> At least Sweden and Denmark use very similar CLIP protocols, the
> difference being mainly in the start and end tones used.
> 
> The different protocol also bites on the other end, as asterisk will
> send callerid information to a phone connected to a TDM40B for example
> using the FSK protocol. Dutch phones don't understand FSK, and hence
> don't pick up on the caller id.
> 
> I'm very interested in solving this problem, as it makes asterisk only
> usable in the Netherlands using ISDN BRI or PRI on the PSTN side, and
> imported phones on the (analog) internal side. I just don't have any
> idea where in the source, and how...
> 
> One possible solution for the 'inside' problem:
> There's one company in the Netherlands offering telefony over cable
> infrastructure, they use FSK signalling for Caller-ID presentation. I'll
> get my hands on a phone suited for their network soon, wich will allow
> me to verify if they work with asterisk.
> 
> -- 
> Envida                     http://www.envida.net/
> Armand A. Verstappen       Graadt van Roggenweg 328
> armand at nl.envida.net       3531 AH Utrecht
> tel: +31 (0)30 298 2255    Postbus 19127
> fax: +31 (0)30 298 2111    3501 DC Utrecht
-- 
Envida                     http://www.envida.net/
Armand A. Verstappen       Graadt van Roggenweg 328
armand at nl.envida.net       3531 AH Utrecht
tel: +31 (0)30 298 2255    Postbus 19127
fax: +31 (0)30 298 2111    3501 DC Utrecht
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