[Asterisk-Users] DID over analog?

[George Pajari]

Michael Collins wrote:

>Analog DID's are a bit backwards compared to normal POTS lines....
>
>If you point a DID number at a regular POTS line then when a call rings
>in it simply rings in like a regular analog phone line.  Unless the
>carrier can provide some form of DNIS on an analog line I believe you'd
>need one POTS line per DID number.  Or you could order one DID trunk
>group and point all of your DID numbers to it and use FXS ports to
>handle those incoming calls...
>  
>

Mr. Collins's explanation is correct, the only fly in the ointment is 
that while FXS ports will electrically connect to an analog DID trunk, I 
don't think anyone has done the work to support analog DID signalling on 
an FXS port.

A workable (but not inexpensive) approach is to get an analog DID trunk 
and then use a converter that handles the DID signalling and converts 
the line into a standard telco trunk appropriate for connecting to an 
FXO port. When the call comes in the converter rings the FXO port and 
once Asterisk answers, delivers the DID digits as DTMF tones.

You can find DID/DTMF converters from these suppliers:
    http://www.exacom.com/html/vertical_markets/did_solutions.htm
    http://www.ctpx.com/html/vp_2000__product_series.html


Good luck!

g.

-- 
George Pajari, netVOICE communications    604 484 VOIP (484 8647 x102)
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