[cisco-voip] SIP to Legacy PBX

[Dennis Heim]

How about an E1 integration to the Cisco gateway and then VOIP to the other end of your 10MB fiber link and then deliver the calls to the other end. Do you have any type of diagram to describe this better?

Dennis Heim
Network Voice Engineer
CDW  Advanced Technology Services
11711 N. Meridian Street, Suite 225
Carmel, IN  46032

317.569.4255 Office
317.569.4201 Fax
317.694.6070 Cell
dennis.heim at cdw.com<mailto:dennis.heim at cdw.com>
cdw.com/content/solutions/unified-communications/<http://www.cdw.com/content/solutions/unified-communications/>


From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Rupert Finnigan
Sent: Wednesday, July 07, 2010 5:26 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] SIP to Legacy PBX

Hi All,

First time poster here, so hello - and thanks in advance for any insight and advice you can offer now and in the future.

I've been working with Cisco equipment for a while now, but have never touched on the VoIP field - however I now have a specific interest which I haven't been able to gather an answer to dispite my best Google-ing efforts.

We've currently got a Nortel BCM 400 system, contected to PSTN via a ISDN30 with 20 channels. I'm looking to consolodate all our conectivity to a 10MB Fibre Leased Line from BT, and route our calls over this connection using SIP either directly to BT, or to an alternative provider, such as Gradwell. However.... our BCM maintenance company won't support SIP directly on the BCM. Apparently, although the BCM will do SIP Nortel won't support it and so it'll leave the Maintenance guys exposed should problems arise. Changing the PBX isn't an option.

Therefore, I'm looking into the possibilty of using one of our Cisco 2821 routers to act as a SIP gateway. It'll provide the BCM with a ISDN 30 PRI, in much the same way as it gets now to remove the Nortel support problems. The other side will be SIP down the 10Mb line to our call provider. And hopefully, some magic will happen in the middle on the 2821 to make this all work "seemlessly"....

Couple of questions really - 1) is it possible, & 2) if it is, can anyone point me in the direction of the recommended reading so I can enlighten myself futher?

I really appreciate any help.

Thanks,

Rupes
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