[Asterisk-Dev] Support for DTMF style callerid signalling

[Andy Powell]

Armand,

I'd like to see this too!!! oooooh yes...certainly for the x100p side of things. 
On the tdm40b side i'd like to see the option of using DTMF CLIP since I
have a number of phones that work fine with the existing setup.... both
my Panasonic DECT and my BT Easicom work fine with the existing 
settings on the TDM side...



Andy


*********** REPLY SEPARATOR  ***********

On 24/07/2003 at 01:47 Armand A. Verstappen wrote:

>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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