[Asterisk-Users] DID over analog?

[Michael Collins]

Ken,

Analog DID's are a bit backwards compared to normal POTS lines.  I don't
know about outside the US, but here (in California, specifically) I've
done a few analog DID installs on some NEC PBX equipment.  The trick is
that with an analog DID line, the CPE provides the battery to the telco
(i.e. the DID phone line plugs into an FXS port on your equipment
instead of an FXO port).  The DTMF's come from the telco but only
because the telco "goes offhook" and sends the DTMF's down the line, and
then connects the call.  

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...

-MC

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Ken
D'Ambrosio
Sent: Monday, January 30, 2006 8:22 AM
To: asterisk-users at lists.digium.com
Subject: [Asterisk-Users] DID over analog?

I've some DID's that I'm using for in-bound faxing, but I'm having some
trouble with getting that working perfectly on my T1.  So I'm thinking
of
pointing them to an analog line.  Will the DID's simply come in over the
analog, presumably sending the DID digits via DTMF?  Or is that not
something that'll work?

Thanks,

-Ken

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