[Asterisk-Users] Linking asterisk to an existing small office PBX

[Philipp von Klitzing]

Hi!

> On December 7, 2004 07:51 am, Nick Burch wrote:
> > Currently, our office has a 24 analogue extension PBX, and 2 ISDN lines
> > providing it with external connectivity. We have several analogue
> > extensions spare, but no capacity to add fancier connectors to link to an
> > asterisk system (as most of the PBX linking guides detail). All our phones
> > are bog standard analogue ones.
> 
> Ok so you have two ISDN PRI or two ISDN BRI?  (i.e. how many
> simultaneous calls can you make or take to the phone network?) 

With 24 analog extensions 2 PRI seems rather unlikely... :-) So let's 
assume 2xBRI = max. 4 simulatenous calls.

> > We'd like to use an asterisk system to allow some calls to be routed out
> > via a VoIP gateway. We'd also like to allow some inbound SIP calls to be
> > handed to the PBX.
> 
> Depending on what you have for incoming lines (see my question above)
> you'd either use a T100P (total 3, may as well get a TE405P) or a
> single Sangoma A102u (2 T1s in 1 PCI card), or some kind of ISDN BRI
> card -- I am *not* familliar with the ISDN BRI stuff, so I'll defer
> that to someone else. 

As Peter S. pointed out I think he really wants to go for a Quad-BRI card 
that allows for NT mode, and thus put Asterisk between the old PBX and 
the telco. Using analog ports on the PBX is clearly not a solution to be 
favoured.

Cheers, Philipp