[cisco-voip] SIP to Legacy PBX

[Norton, Mike]

Nope, that PRI card is for data, not voice. You probably want the VWIC2-1MFT-T1/E1. http://www.cisco.com/en/US/products/ps5854/products_relevant_interfaces_and_modules.html

As for your question of whether you need more DSP, the answer depends on how much DSP you already have. ;-) Do a "show inventory" if you don't know. Use the DSP Calculator on Cisco's website to figure out your total DSP requirement. (You will need to know what codec(s) you plan to do with your SIP provider.) http://www.cisco.com/web/applicat/dsprecal/index.html

You will also need to license an IOS image that has voice features, if your current image does not. http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps10587/ps10591/ps10621/product_bulletin_c25-561938.html

If you have any potential need for a hardware upgrade, could use a spare router, etc. then be sure to at least look into buying a whole new router. By the time you put all the necessary additions into an existing router, sometimes there are decent promotions on "voice bundles" that do not cost a whole lot more. If there happens to be a bundle that has the items you need, it might be an attractive option.

--
Mike Norton
I.T. Support
Peace Wapiti School Division No. 76
Helpdesk: 780-831-3080
Direct: 780-831-3076


From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Rupert Finnigan
Sent: July-08-10 8:13 AM
To: Jim McBurnett; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] SIP to Legacy PBX

Hi,

Thanks for everyone's input so far. I think Jim's suggestion is most along what I'm trying to achieve. I believe that XO take a similar approach to this for our offices in the US, certainly they've got a 2821 that provides a T1 PRI to a BCM400.

Thankfully, our four digit DN's map to the last four digits on the DDIs, so this shouldn't be a major drama.

Obviously, I'll need to get a E1 Interface module for the interconnect the BCM - and I'm currently looking at the HWIC-1CE1T1-PRI. Will this work correctly? Also, am I likely to need any more DSP to handle this extra processing?

Sorry for all these "newbie" questions - I really appreciate the help.

Thanks,

Rupert



On 8 July 2010 00:08, Jim McBurnett <jim at tgasolutions.com<mailto:jim at tgasolutions.com>> wrote:
This is doable..
Configure the router as a Cisco CUBE-search Cisco's site on that..
http://www.cisco.com/en/US/docs/ios/voice/cube/configuration/guide/vb_book/vb_book.html

Basically ---
SIP Dial-peers to the SIP PROVIDER..

h.323 Dial peers to the PRI port..

Read the Cisco Gateways Gatekeepers book for the h.323 config and you will also need the info from there on the translation patterns.


If in the states-I use this rule...
Pulls the first part of the extension of and sends the last 3 digits that you can match on to the h.323 peers..


voice translation-rule 2
 rule 1 /\+\(15555555\)\(...\)/ /\2/


Now if your DID's have NOTHING in common with the extensions, then you're in for some fun

IE 15555552323  goes to ext 879


Later,
Jim

From: cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net> [mailto: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<mailto: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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