[Serusers] ser on linksys router

[Richard]

> > The second one is for nat. For internal calls, there is no nat issue.
> For
> > external calls, the router can be sit on both inside and outside on the
> > network. You can avoid the nat issue on SIP messages.
> 
> NAT issues can be solved using the ip_conntrack_sip kernel module which
> is included in OpenWRT (it's not compiled by default, but a friend of
> mine built a new kernel and it works fine (no STUN or rtpproxy needed
> any more)
This sip ALG has some problems. It is work ok with one phone behind NAT, but
not multiple phones. SIP is very complicated; probably part of reason why
there is no SIP conntrack module available in POM yet.

Richard