[cisco-voip] Polycom Video integrated to Cisco

[Malcolm Caldwell]

On Wed, 2008-09-03 at 09:13 -0500, Philip Walenta wrote:
> To support video through an IOS device requires some unique dial
> peers.  Have a look at this document:
>  
> http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/h320gw.html

Just a quick note: prior to 12.4(20)T using this feature effectively
limits you to 128K calls because there was no support for bonding.

Older versions of IOS (<12.4(20)T) did allow >128K calls using H.221.
In H.221 you need to establish multiple channels using secondary
numbers.  These version of IOS allowed the negotiation of these
secondary numbers via h242, but none of the common endpoints support
h242.  So you must manually configure the secondary numbers.  For
Outgoing calls you do this on the endpoint: common endpoints only have
room for two numbers (primary and secondary) limiting you to 128k.  For
incoming calls the situation is worse: you must configure the secondary
numbers on the gateway.

So, using common endpoints you are limited to 128K outbound and setting
up secondary numbers in the IOS config for outbound.

All is not lost. Bonding was added to 12.4(20)T: 
http://www.cisco.com/en/US/docs/video/milticomm/h320Bonding.html

Bonding is the standard 

I found all this out the hard way.  Although the limitations are
documented it was not apparent until I actually tried this what
"ISO-13871 bonding is not supported for H.320" actually meant. 

I have not yet tried 12.4(20)T and bonding yet, but I am hopeful it will
work.
> 
> ______________________________________________________________________
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Justin
> Steinberg
> Sent: Tuesday, September 02, 2008 8:44 PM
> To: cisco-voip
> Subject: [cisco-voip] Polycom Video integrated to Cisco
> 
> 
> 
> I have a couple of Polycom video units that are currently integrated
> via PRI to an Avaya PBX for ISDN access to the PSTN.
> 
> C.O.---PRI-----Avaya-------PRI------Polycom (VSX8000)
> 
> I am forklifting the Avaya for CUCM. Has anyone used the TDM switching
> functionality in the ISR to switch inbound/outbound PSTN ISDN video
> calls between pots dial-peers to provide the same functionality on
> Cisco that is currently provided by the Avaya PBX?  Any better
> solution than TDM switching that works well?
> 
> I could always fall back on using an Adtran.  Where the C.O PRIs
> terminate to Adtran and the Adtran routes the video DID to the polycom
> units and everything else to the CUCM/ISRs.  But I'd rather not use
> the Adtran if I can avoid it.
> 
> Thanks
> 
> Justin
> 
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