Hi all,
I was thinking about
integrating an old PBX with Asterisk and I was wondering some possible
configurations. The question is: which is the best way to let the 2 systems
interact ? I can imagine some possible scenarios:
- scenario 1: I want
to use other then old PBX terminations (ie I have to link the 2 systems with
some internal number line)
In this scenario I
could think to give each user a dedicated old line number from old PBX to a
'dedicated' port of a TDM card.
Pros: easy
configuration (one - to - one mapping), no old PBX configuration changes, users
with new SIP phone can still mantain their old extension.
Dis: expensive (one
TDM card each 4 ext), not scalable (2 limits: free extension on the old PBX
and PCI slots in the * server to add TDM cards), when I receive a call from a
old extension and I want to forward it to another old PBX extension I am
actually using 2 lines between * and the old PBX.
- scenario 2: I
want to link the 2 PBX with a trunk of n lines nd use an arbitrary number
of SIP phones being able to have # of SIP phones > then # of
lines.
Pros: less expensive
then scenario 1 because the number of lines I have to use between * and old PBX
is based on block probability I choose to have, more scalable for the same
reason, virtually no limit to SIP extension number
Dis: same call
transfer problem of above, if the old PBX doesn't support some sort of DID
between its extension I have to tell * to answer the line and then to ask the
required extension, configuration changes to old PBX...
I know that probably
the best way should be to add a digital card to old PBX and have a trunk
between two systems, but the PBX is really old and I'm not sure I can still find
an expansion card.
Any suggestion or
tip ???
thanks
marco
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