No subject
Tue Sep 5 14:32:44 MST 2006
supported.
Hope that helps a bit -- David Schlossman
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<DIV>><I> I'm still trying to examine a DID solution for this =
customer but=20
don't<BR></I>><I> understand how a single trunk (whatever that is--I =
assumed=20
just a </I>single<BR>><I> pair of wires like a POTS line, but I'm =
thinking=20
now it must not be) </I>can<BR>><I> support multiple (incoming) =
phones=20
calls.</I></DIV>
<DIV><EM></EM> </DIV>
<DIV>As another attempt to help clarify this, I can add that DID is =
a=20
service you subscribe to with your local carrier as a range of numbers =
that are=20
shared over a smaller number of physical DID trunks brought into your =
premise by=20
the carrier. For example, you might buy a block of 50 numbers =
ranging from=20
650-555-5200 to 650-555-5249 and subscribe to 5 DID circuits. =
</DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV>A special signalling method over these trunks delivers the actual =
number=20
that was dialed (the last 4 digits) to the PBX on each inbound=20
call. This is not the same as ANI. This is information on the =
called=20
number, not the calling number. The PBX then interprets the =
dialed=20
number information and rings the proper station. That is a general =
description of how the classic DID service works over inband/analog=20
signalling. Each DID circuit can only handle 1 incoming call at a=20
time. Pure DID circuits are used only for inbound calls, not=20
outbound.</DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Variations on this exist in the digital signalling =
to support=20
the same result (ringing a specific phone with 10-digits over shared=20
trunks). You can do this with ISDN or T1 or Inward 800 service =
(aka DNIS)=20
or other means. In some of these cases, the same lines may be used =
for=20
2-way traffic (inbound and outbound). None of these are the =
same=20
services from the carrier and don't interface with the PBX the same way. =
They=20
all have a much different pricing structure ranging from, say, =
$50/mo per=20
DID line, to hundreds or thousands per month for T1 or ISDN PRI (24 or =
23=20
channels).</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>From what I understand of the Digium cards, DID =
signalling is=20
not supported.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><FONT size=3D2>Hope that helps a bit -- David =
Schlossman</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV></BODY></HTML>
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