Voice gateway with ISDN30 PRI connect to the callmanager CUCM 8.5 ?

[edsge teenstra]

Hi guys

We need to select a module that supports ISDN PRI for incoming phone calls , we want it to be supported in the CISCO1921 router, we will have the router function as the voice gateway and we have a call manager with CUCM as the phone system.

The ISDN PRI line in has these specs :

Service type :VBC60 PRI - Primary rate interface

Geographical numbers : 250 DDI (Direct dial in numbers)

I am quite confident that we need this module  VWIC3-1MFT-T1/E1 , this 3rd generation voice wan module works in the CISCO1921 router ,  i am not sure about the amount of channels needed. Do we need to add PVDM's at all  ? If we would have a ISDN30 connection to  Vodavone a PVDM3-32 would be fine ?

http://www.cisco.com/c/en/us/products/collateral/routers/2800-series-integrated-services-routers-isr/data_sheet_c36-609138.html

We want to call only with Cisco wired and wireless IP phones and have a MCS-7816I5-K9-CMD2 server with CUCM version 8.5 connected to the network.

Is there anything i missed to make this phone system work ?

Thanks for all feedback received

Edsge

[Gordon Ross · Accepted solution]

Quickly scanning the data sheet for the 1921 ( http://www.cisco.com/c/en/us/products/collateral/routers/1900-series-integrated-services-routers-isr/data_sheet_c78-598389.html ) I don't think it will work for you.

There are no DSP slots on the motherboard and there's no voice feature set IOS available for it.

GTG

[Aman Soi · Accepted solution]

[+5] to GTG.

you can also refer the link

https://supportforums.cisco.com/discussion/12451996/1941-router-voip-isolicense

regds,

aman

[edsge teenstra]

Thanks for the answer

I am bit dissapointed .. i did not expect that on the newer ISR G2 .. i assumed it would support voice and dsp's .. but like they say asume is wrong and asume is mother of all fuckups ...

So we have to move to the CISCO29xx series .. that is clear.

When we have the right router / technology package license (UC) what amount of channels do we need for ISDN30 and 250 DDI lines (direct dial inward) ?

[Gordon Ross]

The G2s do support voice: You just happened to pick a low-end model that's not designed for voice. Low end models are often designed for a price-point, so some features have to be omitted.

BTW - You do know the 29xx router series has now been replaced with the new 4400 series? (Hint: Watch out with the Cisco docs with this new range: Not all the routers in this range were released at the same time and some docs haven't been updated to accommodate the latest models in the range)

The number of channels you need has nothing to do with the number of DDIs you have. It's all to do with the amount of traffic you expect. You can have 250 DDIs on a simple 2-channel BRI if you want!

NOTE: If you configure your router in MGCP mode, CallManager cannot use a fractional ISDN-30: CUCM expects to use a full 30 channels. If you configure your router to use SIP or H.323 this limitation does not apply.
 

GTG

[edsge teenstra]

Thanks for your feedback.

You wrote :

NOTE: If you configure your router in MGCP mode, CallManager cannot use a fractional ISDN-30: CUCM expects to use a full 30 channels. If you configure your router to use SIP or H.323 this limitation does not apply.

We where planning to use SCCP on the phones. Since the customer wants to use his Vodafone PRI connection. They do not want use a SIP provider they want their own call manager. 

I am not aware of the fact if he has fractional ISDN PRI or normal ISDN PRI , i just asked him for confirmation. He just said they have a Vodafone PRI line with a VDC60 service type and 250 DDI.

Further if it appears they use fractional ISDN is there no workaround ?

EDIT: So when they use the full 30 channels on the ISDN30 we need at least a PVDM with 30 channels is that correct ?

I know there is a Cisco tool in where you can calculate with what codec etc etc you need what amount of DSP's/channels but i do not want to make it to complicated.

And depending on the platorm we need to make a choice for the corresponding PVDM . ISR G2 uses PVDM3-16 PVDM3-32 PVDM3-192 PVDM3-256.

And the older ISR uses PVDM2-8 / PVDM2-8 / PVDM2-16 / PVDM2-32 / PVDM2-48 / PVDM2-64 modules .

[Gordon Ross]

You're getting confused with protocols here. You're using ISDN-30 from your telco to your ISR. Then the ISR needs to talk some protocol back to CUCM. (MGCP, SIP, H.323). Your phones can talk a completely different protocol (SIP, SCCP, H.323) back to CallManager. CallManager handles the "protocol translation" (for want of a better phrase). e.g. On my system, I have mainly MGCP ISDN gateways with SIP & SCCP phones. They all work happily together.

Your PVDM side should match the size of your interface. So if you've got an ISDN-30, you need a 32-channel PVDM.

As I said before, gateways using the MGCP protocol cannot use fractional ISDN-30s, so you'll need to configure your gateway to use either SIP or H.323.

I suspect you need to do a bit more background reading on CUCM....

GTG

[edsge teenstra]

Thanks for the response.Yes you are right i need some more reading into the CUCM. MGCP i was not familiar with i heard it a couple of times so i started thinking it might be a IPphone protocol like SCCP/skinny and SIP

I maintain a voip network with SPA/Cisco IP phones that have a SIP image and use the SIP protocol... but that is quite easy , the gnTel provisioning webinterface (hosted by the voip provider) makes me configure extensions and accounts , a account code and a account password are entered inside the the phone and then they connect to the gnTel VOIP provider cloud PBX.

Also i have setup a CUCM callmanager in the LAB with CP7940G phones and made all working .. but without the voice gateway part.

Now my customer is not a expert either he keeps telling me he using the full PRI interface .. and keeps saying he has 250DDI lines ..

now i asked him to confirm he has a ISDN30 or fractional ISDN30 but he does not confirm so that might not be the case...