Do you use most of you PRI channel from the PSTN enough to feel that you
Asterisk box can handle the load? I guess that if the TE405P card
"hairpins" the channels that go out the other span it would take much of
the load off of the server. Anyone else know for sure if these
quad-span cards are able to do this because this would suggest that the
quad-span card would offer more advantages in this setup than just
expansion capabilities.
Peter Svensson wrote:
On Sat, 11 Sep 2004, Clif Jones wrote:
I have a friend with a PRI coming into a modem bank that is receiving
56K modem calls and some ISDN data calls. He wants to dump his analog
office phone lines and use some of the capacity on the PRI. I have been
digging through the mail archives and Wiki site on this subject but the
information I found doesn't give me a high enough confidence to go buy a
few T1 cards and try it out. There is talk of using Asterisk as the
termination of the PRI from the PSTN and then forward calls for the
modem bank via another T1 span and a cross-over cable. Others talk of
splitting the calls off with specialized equipment before it reaches the
Asterisk box. Does anyone actually have the same (or similar) scenario
and if so what was your solution? If you are using Asterisk to do the
switching, I would be interested in seeing your relevant config files.
My primary concerns are:
- The load on the Asterisk box if it is acting as a router for the
incoming ISDN calls.
- Effect of 56K modem dialup connections or ISDN data calls passing
through an Asterisk box.
We have something like this set up.
pstn <-pri-> asterisk <-pri-> pbx <-bri-> isdn modems
<-bri-> isdn modems
...
The isdn modems handle both isdn data and analog modem calls without
problems. The call is bridged inside the TE405P card I think. There is no
noticable load on the asterisk server.
Peter
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