[cisco-voip] Cisco 7960 woes

[Chris Ward (chrward)]

Joe,

I imagine the since TFTP is UDP and UDP is stateless, the firewall may
need some configuration to allow this traffic through. As for the
original scenario where you got one-way audio, you will need to turn on
SCCP inspection on the firewall so it can re-write the IP addresses
properly to allow for two-way audio. If this is not working, you should
consider upgrading the firewall to a later/latest version (I know the
ASAs are always improving SCCP inspection with new releases, but not
sure what type of firewall you have).

HTH

-Chris


-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Bill Simon
Sent: Tuesday, July 14, 2009 10:42 PM
To: Joe Mays
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Cisco 7960 woes

What signaling protocol are you using?

Joe Mays wrote:
> Okay, trying to set up some Cisco 7960 phones to work together. I put
> one (phone A) behind a firewall router doing NAT and had an internal
> address assigned. It came up fine, but I was getting one way audio
> with another phone. That turned out to be because the other phone
> (phone B) was responding to phone A's internal address rather than
> than the external address of the firewall.
> 
> Okay, simple solution. I applied a real address block to the inside of
> the firewall, turned off NAT (and all firewalling, actually) and let
> it assign a publically addressable IP to the phone. Now the phone
> comes up, gets it's ip, but fails to contact the tftp server to
> download its config. I can't see why this would be happening, when it
> was able to contact the tftp server before. Clues?
> 
> Better still, a straightforward description of everything that should
> be set up on the server and the phone and what the xml file donwloaded
> in tftp should contain would be a huge help.
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