[Asterisk-Dev] Support for DTMF style callerid signalling

Andy Powell andy at beagles-den.demon.co.uk
Mon Jul 28 05:44:42 MST 2003


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...


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

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

>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?
>-----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
>Asterisk-Dev mailing list
>Asterisk-Dev at lists.digium.com

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