[Users] Re: [Serusers] When is RTP Proxy needed?

Michal Matyska michal at iptel.org
Mon Apr 30 22:01:46 CEST 2007

You provided the answer by yourself.....
when most of the clients are behind NAT then you definately MUST count
with rtp/media proxy in your setup, because you are not able (neither
willing :-) to control the NATs.

Depends havily on the client if you have to use it when:
a) both clients are behind NAT
b) any of the clients is behind NAT

OK, let's say 90% users behind NAT... a) is then in 81% of calls, b) 99%
of calls. Just an example.

To prevent rising subsequent questions - check active/passive direction
attribute in the SDP body.


On Mon, 2007-04-30 at 14:12 -0400, lists at infoway.net wrote:
> Hi all,
> We are interested in developing yet-another peer-to-peer VoIP service. Something with a simple Softphone/IM-like client that allows users to talk/chat with one another.
> However, and pardon our technical ignorance, we don't have 100% clear if/when we need to use something like rtpproxy or mediaproxy. Basically, we want to do all the setup of the calls and keep track of CDRs. However, we're hope that the client's actual media traffic will flow directly among the users and not have to come through our servers.
> For practical purposes, most users will be in domestic US with some sort of xDSL service and behind NAT.
> Eventually, we would like to offer voicemail services and even PSTN termination (for a fee) to these users.
> Can anyone shed some light as to when, if really needed, will something like rtpproxy kick in?
> Thanks
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