[c-nsp] NAT/PAT/Port Forwarding and VOIP

[Joseph Jackson]

I believe something like this would work for you. 
http://www.cisco.com/en/US/products/ps6350/products_configuration_guide_
chapter09186a0080455acd.html#wp1067625

It talks about inspection of h.323 traffic crossing the router.  

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Eric D. Meyers
> Sent: Tuesday, October 24, 2006 2:09 PM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] NAT/PAT/Port Forwarding and VOIP
> 
> With a NAT translation, is it possible to 'trigger' or 
> pinhole the opening of ports on a Cisco router?  For example, 
> if an inside host communicates on a specific port or range of 
> ports can the NAT be configured to open an inbound port on 
> the outside interface to communicate with that host?
> 
> 
> 
> I've got a couple of Siemens 420 IP phones (using HFA rather 
> than SIP, by the choice of our telephone group) sitting 
> behind a Cisco 827 ADSL router.
> The phones are able to communicate with the gatekeeper 
> initially and receive their configuration, but unable to 
> establish a call unless TCP1720 is opened.  Static mapping 
> work well, but I'd rather have something a bit more dynamic.  
> I've tried to accomplish this under PAT (using the 'overload'
> option) and using a NAT pool; no joy on anything I've 
> attempted as yet.
> 
> 
> 
> If anyone has assistance to offer it would be quite 
> appreciated.  There might be some e-beer in it for ya.
> 
> 
> 
> Eric Meyers
> email:   emeyers at utk.edu
> 
> 
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