[Kamailio-Users] NAThelper and multipart SDP

[Alex Balashov]

Daniel-Constantin Mierla wrote:
> Hello,
> 
> On 06/22/2009 11:37 AM, Alex Balashov wrote:
>> [...]At the same time, the Kamailio leadership appears to have much 
>> more perspective and standardisation on rtpproxy, as well as whatever 
>> RTP forwarding module is being lifted from IPTel.org for SIP-Router.
> 
> rtpproxy does more now than packet forwarding (e.g., playing audio, moh, 
> repacketization ...), therefore needs to stay in user space, see:
> http://www.rtpproxy.org.

I did not mean to suggest that it is a liability of rtpproxy that it is 
implemented in userspace.

Someone does need to do a study to see if kernel vs. userspace 
forwarding really makes that much of a difference, though.  I suspect 
that although it does make a difference, it is not nearly as much of a 
difference as is commonly thought.

Perhaps I will do this study at Evariste and publish the results.  The 
problem is I do not know of a good load-testing tool that generates 
bidirectional media.  There is SIPP, but it is good for signaling and, 
at best, instantiating one-way media flows only, and also has the 
problem of making the far-end endpoint the limiting factor.  Is it 
possible to set up SIPP or something like it (open source?) on two 
endpoints and make them set up calls between themselves with media in 
both directions?

-- 
Alex Balashov
Evariste Systems
Web     : http://www.evaristesys.com/
Tel     : (+1) (678) 954-0670
Direct  : (+1) (678) 954-0671