[Asterisk-Users] Phones that work well through NAT

[Ron Senykoff]

> > Polycoms (the IP501s at any rate) work EXCEPTIONALLY well through NAT.  It's
> > as literally dead-simple as plug-and-go.  No configuration on the phone, and
> > all you want is a nat=yes in their sip.conf entry.  That's it.  Seriously.

In addition to nat=yes, I recommend adding qualify=yes for all phones
behind NAT. Otherwise the router doing NAT may flush out the port
mappings relative to your phone. The qualify essentially sends a
keep-alive. We have Polycom IP500s and 501s and this works very well
for them (one sitting right here on my desk).

-Ron