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

[XTRANET Technik]

Am Monday, 28. March 2005 00:22 schrieb 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.

I think, I didn't describe my "wish-list" very good....

We have connected our firm via ISDN-lines to official networks. Also we need 
to connect a branch office via SIP behind a (to be installed) SIP-Server. In 
this branch office a already existent PBX should be connected. To reach the 
extensions in this PBX directly (from network and main office) I need the 
possibility to do signalling in the way like "DDI" to the PBX.

For example: 
Given is Phone-Number 12345, connected via ISDN to our firm.
The numbering-plan say's, extensions beginning with 75 should be routed to our 
branch office.
So if you dial 12345-7511 you should be directed to extension 11 of the PBX in 
the branch office. In the branch office's PBX the numbering-plan has been 
defined to 2-digit extensions.
If you dial 7511 from an extension in the main office you also should reach 
extension 11 in the branch office.

The physical connection of the PBX in the branch office to SIP should (if ever 
possible) be done via a "black box".

I'm thinking of a SIP-Server configuration like "route all numbers beginning 
with 75 to extension 75 and give the rest of the originally dialed number as 
DDI-Information to the connected equipment"


Cheers,
  Peter