[cisco-voip] Re: Cisco VoIP IP-IP gateway

[Chris Roberts]

Heh,

You can run the Gatekeeper on the same box with the jsx release. I've got a
lot further with this now, however, I now have this:

|     Private network       |  Public Network         |
         GKA         GKB
CM <---> GWA <-----> GWB <-----> PSTN-GK <----> PSTN GW

The idea being that GKA/GWA is the local site gateway, with the call manager
routing all calls to this. This gateway also has PSTN interconnect for our
incoming voice traffic.

Gatekeeper/Gateway B is our IPIPGW/via-zone GateKeeper, and interconnects
our private network to the public PSTN IP network.

All seems to work now, and calls from the CM seem to progress, however upon
dialing there is no ringback on the IP Phone, and the remote end will ring
for a couple of seconds, before the Callmanager seems to drop the call and
stop trying to connect. This happens even if you answer the remote phone in
the few seconds you have.

What should I check for in this scenario? I assume signalling is working
okay, since the remote end rings. Possibly the end-to-end RTP connection, or
H.245? How can I debug this on the Cisco CallManager?

Thanks in advance,
Chris. 

> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net 
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Chris Roberts
> Sent: 17 January 2005 01:07
> To: cisco-voip at puck.nether.net
> Subject: [cisco-voip] Cisco VoIP IP-IP gateway
> 
> Hey,
> 
> We have a gatekeeper to which we currently register directly. We have:
> 
> CM/Phones <---> GW <-- E1 PRI --> GW <-- IP --> GK
> 
> In this way the CM/Phones sit in our private network and are 
> isolated from the outside IP network. I'd like to remove this 
> back to back PRI and use an IP-IP gateway to proxy the 
> traffic from our CM/Phones to the GK, so that we can add more 
> sites with gateways, and as an alternative to NAT (which I 
> understand doesn't work well with H.323 - in either case our 
> firewalls don't really support QoS, so I'd rather do it on a 
> separate platform). I've been messing with the Cisco IP-IP 
> gateway, however after lots of trouble I finally found a 
> section in the docs that states you need a via-zone 
> gatekeeper to make the IP-IP gateway work with RAS. 
> Currently, with the IP-IP GW configured to register with the 
> GK, and the relevant dialpeers and such configured into the 
> IP-IP GW, I get calls rejected with rejectReason 
> undefinedReason. Is this a bug, or is this because of the 
> lack of a via-zone GK? Is there any way I can implement this 
> proxy without the via-zone gatekeepers? I don't want to add 
> two boxes for this purpose since it seems that a 2621 would be enough.
> 
> Will multimedia conference manager do what I need? IP-IP GW 
> seems to be the way to go, and the replacement for MCM, but I 
> don't want to have to install a GK and GW just for the network edge.
> 
> Has anyone done similar to this and got it working?
> 
> Cheers,
> Chris.
> 
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