[cisco-voip] Generating PRI for Cisco-Tandberg-Codian 3241 ISDN gateway

[Matthew Saskin]

What are you seeing for disconnect codes when the call drops?  Can you post
the q.931 debugs?

Matthew Saskin
msaskin at gmail.com
203-253-9571

July 18, 2010 - 1500m swim (in the hudson), 40k bike, 10k run
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On Wed, Jan 27, 2010 at 5:02 PM, Robert Kulagowski <rkulagow at gmail.com>wrote:

> If anyone remembers the saga of using a Cisco router as H.320 to H.323
> gateway, after 2 years I've pretty much given up.  Even with IOS 15.0, it's
> very unreliable.  The TAC guy that I've been working with has been helpful,
> but it always seems to be one thing or another with H.320 or H.323 low level
> parameters, and "the other end" not doing something correct with regards to
> call setup or whatever.
>
> Since I can't change the rest of the planet and get them to do it "The
> Cisco Way", I'm going to approach my issue differently.
>
> I have Codian 3241 ISDN gateways.  They work just fine in allowing H.323 to
> H.320 calls, so Codian has got it figured out, even if Cisco isn't there
> yet.
>
> Should it be possible to connect a 3241 to a 2851 over ISDN PRI (back to
> back) and be able to place video calls?  I'd like to peel off portions of my
> existing DID range and make them available for video calls.
>
> In my lab I've got a 3241 connected via T1 crossover and have the serial
> port on the 2851 configured for isdn network-protocol-emulate.  The PRI is
> up.
>
> Outbound calls from the 3241 are hitting the router and going out to the
> telco.  I can see in the q.931 debugs that 6 b-channels are brought up, but
> then the calls drop about 17 seconds later.
>
> Is there anything "special" I need to do on the 2851 to allow it to work?
>
> I've got:
> network-clock-participate wic 0
> network-clock-participate wic 1
> network-clock-select 1 T1 0/0/0
> network-clock-select 2 T1 0/1/0
>
> controller T1 0/0/0
> ! To the Telco
>  cablelength long 0db
>  pri-group timeslots 1-24
> !
> controller T1 0/1/0
> ! To the Codian 3241
>  cablelength short 110
>  pri-group timeslots 1-24
> !
>
> interface Serial0/0/0:23
>  no ip address
>  encapsulation hdlc
>  isdn switch-type primary-ni
>  isdn supp-service name calling
>  isdn integrate calltype all
>  no cdp enable
> !
> interface Serial0/1/0:23
>  no ip address
>  encapsulation hdlc
>  isdn switch-type primary-ni
>  isdn protocol-emulate network
>  isdn integrate calltype all
>  no cdp enable
> !
>
> dial-peer voice 100 pots
>  description Connection to Codian 3241
>  incoming called-number .T
>  direct-inward-dial
>  port 0/1/0:23
> !
> dial-peer voice 300 pots
>  description Connection to Telco
>  destination-pattern 1..........
>  forward-digits 11
>  port 0/0/0:23
>
>
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