Iptables breaks a working VoIP phone?

[Dave Smith]

Kenneth Burgener wrote:
> I have dropped packets being logged, and I can see the
> source/destination IP and port of an occasional packet being lost.  I am
> not sure the packets I am seeing a from the direct phone call or some
> sort of "ping" VoIP traffic.  When I put in the rules where it would
> forward ALL TCP/UDP traffic to the Sipra box, these logs would no longer
> appear, but the phone calls were still broken.
>   

Have you run Wireshark on the phone-side to see what the traffic looks 
like in both scenarios (1, with the Linksys router, and 2, with the 
Linux firewall?)

--Dave