[Serusers] NATHelper

[Maxim Sobolev]

Craig Graham wrote:

> I have a very small setup; at the office there's a few machines behind an
> Intertex IX66 NAT box, that does a fairly good job of SIP as far as we can
> tell from the few connections we've had to other sites.
> 
> At home, I have a few machines behind a Linux box, doing NAT. All user
> machines are running MS Messenger.
> 
> For a long time I've been trying to get a decent SIP service at home. I've
> tried both Partysip and Siproxd, both of which give me voice connections but
> no presence, IM, video or additional streams for whiteboards or Messenger's
> "application sharing."
> 
> I've been picking up snippets about NATHelper, which as I understand it
> allows SER to run on a NAT box and allow people to call across the NAT box.
> However, I've also seen a couple of messages that suggest that as of October
> this module was only handling single audio streams, which is the same as I
> have at the moment with Partysip and Siproxd. Is my understanding right and
> I'll have to wait a bit longer before trying SER, or does it already do
> multistream?

Multistream is video + audio, right? If so, then yes, only single audio 
stream is supported at the moment, though it would be trivial to add 
support for multistream as well. Please also note that currently I am 
working on next version of nathelper/rtpproxy, which would allow 
"bridging", i.e. the configuration when ser/rtpproxy runs on NAT box, 
listens on both private and public addresses and relays SIP/RTP traffic 
between public and private interfaces.

-Maxim