16 Jan
2004
16 Jan
'04
10:27 a.m.
Kevin Chu wrote:
Hi,
I have a couple questions for rtpproxy/nathelper:
(1) Can rtpproxy/nathelper support calls with multiple media
sessions (e.g. video conversation between WMs)?
Theoretically yes, but volunteer needed to code this functionality in
and test it.
(2) Is there any plan for adding the support for
non-symmetric
RTP UAs like Siemens SCS client in the near future?
Yes, I already have this support in my local development tree and plan
to merge it into public version of RTP proxy/nathelper in the next few
days. Please note, however, that RTP proxy will not do any NAT traversal
for such UAs, they should be either located on public IP or use some
other technology to overcome NAT (e.g. STUN, UPnP, manual configuration
of ports forwarding on NAT box etc). Nevertheless this support is useful
when at least one of two parties is RTP symmetric (e.g. call from
RTP-symmetric UA from behind a NAT to non-RTP-symmetric UA on public
address). Please also note that there is no other way to detect
non-RTP-symmetric UA than to compare User-Agent/Server header field
against list of known non-RTP-symmetric UAs.
-Maxim
Thanks,
Kevin
---------------------------------------------------------------
Date: Wed, 07 Jan 2004 19:19:32 +0200
From: Maxim Sobolev <sobomax(a)portaone.com>
Subject: [Serusers] New versions of RTP proxy/nathelper commited
To: serusers(a)lists.iptel.org
Message-ID: <3FFC3FA4.6040800(a)portaone.com>
Content-Type: text/plain; charset=us-ascii; format=flowed
Hi,
I've just committed major update for rtpproxy/nathelper, which adds
support for proxying RTCP and also make RTP proxy behave much better for
non-NATed clients by pre-loading remote addresses[1] of each party from
the SIP request/reply. Please note that proxy's command protocol has
been extended to support new functionality, so that you need both new
rtp proxy and new nathelper (old nathelper will not work with new rtp
proxy and vice versa). Both of them can be obtained from the ser's cvs
repository:
http://cvs.berlios.de/cgi-bin/viewcvs.cgi/ser/rtpproxy/
http://cvs.berlios.de/cgi-bin/viewcvs.cgi/ser/sip_router/modules/nathelper/
Please let me know if there are any problems with the new version.
-Maxim
[1] currently only IPv4 addresses can be pre-loaded, though it should be
trivial to extend proxy, nathelper and command protocol to accomodate
IPv6 as well. Proxy's core supports IPv4<->IPv4, IPv4<->IPv6 and
IPv6<->IPv6 relaying already both for RTP and RTCP.