[Asterisk-Users] Integrating an old PBX with Asterisk

[Marco Vescovi]

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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