Iptables breaks a working VoIP phone?

[Shane Hathaway]

Kenneth Burgener wrote:
> lsmod shows a "conntrack_sip" loaded, so I assume it somehow magically
> detects SIP traffic, or is there something more I need for the
> configuration?

Probably not.  At this point you really need tcpdump and wireshark to
find out what's wrong.  Alternatively, you could run Asterisk or a SIP
proxy on the router, as others wisely suggested.

Shane