On Wed, 18 Jan 2006, Dave Lag wrote:

> Peter wrote:
>
>> What I meant was, you get to calculate the messages yourself, and store 
>> them if you want it to be compatible. I also think that the Contact ID 
>> requires some special tones which cannot be made with a regular DTMF (and 
>> which are not issued by the cheap alarm dialers I alluded to).
>> 
>> Peter
>
> MF or the "extra row" of DTMF?
> D

Afaik the Contact ID uses non-dtmf start and stop tones. The simple 
alarms cannot use these.

Peter
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