[cisco-voip] SCCP NAT Question

[Max Pierson]

Hi Ash,

First off, can you confirm your signaling proto from the 2811 to the CM
(SIP, H.323, etc) ?? Second, what are the NAT metrics set to (as in timeout
values, etc, so how long does the nat process keep the entry valid (default
or did u make changes)?   Bugs are possible in the "T" train as well  ;)

There are a few caveats when using H.323 and NAT (at least since my older CM
days and 12.3 IOS). As you stated, you're "inspecting" SCCP traffic. What
does your "show" output commands say about the inspection??

My end solution was to do a "one-to-one static nat translation called by a
route-map" to the CM Pub and Sub's to resolve the issue, but I need to know
a little more about your environment.

Regards,
M

On Mon, Jan 17, 2011 at 10:10 PM, ash AD <commo_ssg_31f at yahoo.com> wrote:

> Have phones being NAT'd that continue to reboot as if they lose
> registeration. Router is a Cisco 2811 running 12.4(24)T4 Adv Ent Services.
> There is NAT between the CallManager and three 7941 SCCP phones on the LAN
> side of the router. The phones are running SCCP 8.3(5). The router is doing
> PAT using its public IP'd interface. An IP inspect policy set to inspect
> SCCP is applied on the egress direction of the public IP'd interface. If the
> phones are placed on the same IP subnet as the outside interface with public
> IPs, the register and maintain registration. So, this WAN segment has full
> IP access to the CM. Any advise or expirience with over coming this issue.
>
> -Pete
>
>
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