[cisco-voip] Publishing CCM through NAT disconnect call after 10 minutes

[Kevin Thorngren]

Hi Brian,

You might be running into this:
CSCsa49340 - NAT should support garbage octet for TCP keepalives per 
RFC1122
Cisco IOS Network Address Translation (NAT) does not support TCP 
keepalives that have
a garbage octet per section 4.2.3.6 of RFC1122.


With the later CCM OS builds Windows has decreased the TCP KeepAlive 
timer via a registry entry.  This is to reduce the chance of having a 
security breach.  The KeepAlive that Windows sends is per the above RFC 
but NAT does not support this in the version you are running.  Looks 
like the fix is in 12.3(11)T4.

HTH,
Kevin
On Jun 21, 2005, at 3:18 AM, Brain Whistler wrote:

> Hi,
>
> I have published my call manager through static NAT on
> my router with IOS 12.3.11T ipvoice. While at user end
> I am using IP softphones which are running on "ip NAT
> overload".
>
> The problem I am facing is that my every inbound and
> outbound calls get disconnected after 10 minutes.
>
> Does anyone know where is the problem, or there is a
> bug with the NAT on mentioned IOS.
>
> Thanks
> Brain
>
>
> 		
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