[Asterisk-Users] Asterisk and call delivery to connected PABX

[Rich Adamson]

> I'm VERY new in using VoIP. I'm looking for any tip or trick to connect a 
> physically PABX behind an Asterisk-System(or similar) via an SIP to Analog- 
> or ISDN-Converter. The point is, I _need_ to deliver calls to extensions in 
> the connected PABX directly (in ISDN-speech "DDI" (DirectDialIn)) without 
> intervention of an operator. Is this technically possible, and if yes HOW?
> Tips for Hardware-Converters (SIP->ISDN(EDSS1), SIP->Analog) are also 
> appreciated.

Lots of ways to do it, but will be dependent on the type of facilities
available in the pabx, the number of simultanous calls you want to
support, etc.

A couple of examples...
1. Digium PRI-T1 card to a pabx PRI (23/30 channels available)
2. Digium TDM-fxo card to pabx analog line (4 channels)
3. Sipura spa3000 adapter to pabx analog line (1 channel)

You might want to dig through pages on the wiki at:
 http://www.voip-info.org/tiki-index.php?page=Asterisk
for lots of good references.