H.320 - H.323 Gateway

Answered Question
Jun 27th, 2012
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Hi,


I need a H.323 - H.320 Gateway solution.I've trying some hardware configurations on the Cisco Dynamic Configuration Tool and I came up with this:


Product                       Description                             Quantity

CISCO2901/K9                 Cisco 2901 w/2 GE,4 EHWIC,2 DSP,256MB CF,512MB DRAM,IP Base1        

S29NPEK9-15104M               Cisco 2901-2921 IOS UNIVERSAL - NO PAYLOAD ENCRYPTION1        

SL-29-UC-K9                   Unified Communication License for Cisco 2901-29511        

FL-CUBEE-5                    Unified Border Element Enterprise License - 5 sessions1        

FL-GK-2901                   Gatekeeper Feature License -2901 platform1        

VIC2-2BRI-NT/TE               Two-port Voice Interface Card - BRI (NT and TE)2        

PVDM3-16                     16-channel high-density voice and video DSP module1        

CAB-ACE                       AC Power Cord (Europe), C13, CEE 7, 1.5M1        

CAB-AUX-RJ45                 Auxiliary Cable 8ft with RJ45 and DB25M 1        

CAB-CONSOLE-RJ45             Console Cable 6ft with RJ45 and DB9F   1        

PWR-2901-AC                   Cisco 2901 AC Power Supply             1        

ISR-CCP-EXP                   Cisco Config Pro Express on Router Flash1        

MEM-2900-512MB-DEF           512MB DRAM for Cisco 2901-2921 ISR (Default)1        

MEM-CF-256MB                 256MB Compact Flash for Cisco 1900, 2900, 3900 ISR1        

SL-29-IPB-K9                 IP Base License for Cisco 2901-2951   1    


I want the Gateway to act as H.323 Gatekeeper aswell. I have 3 ISDN lines (that's why I need 2xVICs).

I have doubts about the DSPs and the License. According with some Cisco documents I read, I need TI C5510 DSPs or NM-HD2V (which supports C5510 DSPs) to make the videocalls work, but here I selected PVDM3-16, which I think hasn't the TI C5510. Should I install PVDM2 instead of PVDM3 with the adapter? Do I need the Unified Border Element Enterprise License? Does the Cisco 2901 fully support H.320 calls?


Thanks in advance,

Julio

Correct Answer by paolo bevilacqua about 5 years 1 month ago

The PVDM3 support all the features. You don't need any other type of DSP in the router.

You don't need the the CUBE license. You can read documenation to learn about IOS features.


All this being said if you only need  an  ISDN / IP videoconf gateway, maybe is better that you choose one from the dedicated line of products.

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Correct Answer
paolo bevilacqua Thu, 06/28/2012 - 14:13
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The PVDM3 support all the features. You don't need any other type of DSP in the router.

You don't need the the CUBE license. You can read documenation to learn about IOS features.


All this being said if you only need  an  ISDN / IP videoconf gateway, maybe is better that you choose one from the dedicated line of products.

jcgarciap Fri, 06/29/2012 - 01:27
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Thank you Paolo,


I've been taking a look at the Telepresence product line, since the old IPVC line is already in EOS, but I couldn't find any product with BRI. The ISDN GW 3241 only supports PRI. It's not easy to find a dedicated product for this purpose in the market...apart from RADVISION Gateways, that's why I thought about a Cisco router acting as a GW.


Thank you again,

Julio

paolo bevilacqua Fri, 06/29/2012 - 03:18
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One reason is that BRI VC is largerly legacy so there ino more interest in the market. You may be able to still find unsold 3522s units from distributors, or buy used. Otherwise I recommend you test the router solution before committing to it.


Thanks for the nice rating and good luck!

jcgarciap Tue, 07/31/2012 - 08:23
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Hi again,



I finally tried the solution with the 2901. I managed to establish communication from Huawei IP-VC equipments in the H323 side and a Lifesize Networker GW in the H320 side, using H264 and G711uLaw for video and audio, over only one BRI at 128k, but (a big but), after some time (half a minute- one minute), the outgoing video stream stops, and after some more time, the incoming stream also stops. I checked that the Huawei VC and the remote LifeSize codec are still sending the stream, and I noticed that the DSP stopped processing video data with the command "show voice dsp" (the TX/RX count on the video stream just stops). The audio stream keeps on working just fine.


Any idea of why is this happening or how can I troubleshoot this a little bit more?


Thanks in advance,

Julio

paolo bevilacqua Tue, 07/31/2012 - 12:18
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That is the reason why I was recommending not to use routers for videoconference: stabilty.


I think you will have to engage the TAC to chase what appears to be a bug, possibly DSP crash.

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