asterisk users - Aug 2010 - How to set up Asterisk to deliver a trunk sip connection?

Hi,

I'm trying to set up an "old" PBX (that supports SIP) to go
through our
new Asterisk server, so that our old phones can be used still for some
time.

How can I set up Asterisk to deliver a trunk sip connection that our old
PBX can connect to? Is it just to sett up a normal sip device in
sip.conf? Or is there some other / extra magic for this to work?

I can't test this with the old system before we go live with Asterisk
(and then it must work). But I can't seem to find any concrete
information about this.

Best regards,
Kent Varmedal

On Wed, Aug 11, 2010 at 10:12 AM, Kent Varmedal <kent at domeneshop.no>
wrote:
> I'm trying to set up an "old" PBX (that supports SIP) to go
through our
> new Asterisk server, so that our old phones can be used still for some
> time.
>
> How can I set up Asterisk to deliver a trunk sip connection that our old
> PBX can connect to? Is it just to sett up a normal sip device in
> sip.conf? Or is there some other / extra magic for this to work?
Pretty much. The details vary on codec / DTMF, etc. based on what
you're talking to, but that's the general idea.
> I can't test this with the old system before we go live with Asterisk
> (and then it must work).
Really? Why not? If it speaks SIP, it should be able to do multiple
SIP trunks / channels, and you should be able to set up a simultaneous
SIP trunk alongside your production line(s).

If you tell us the PBX, somebody here has probably worked with it.

If the old PBX speaks true SIP, you could ditch the old PBX, and have
the SIP phones register directly with asterisk.