I have not looked much into this, but I was under the impression that it's a client-side thing, as I read it the SDP contains various IP's for the media, the public (which the phone seeks out via STUN) and the private, the other phone tries to connect to each of those and the first answer it get's it uses for the media path, as a LAN should answer always faster than a WAN, it should create the mediapath directly between the two devices, therefore FS will not see the media and interacts only with the signaling.
This is how I have interpreted ICE.
Now, if it does not work this way I appologize, up to now I did not have any use for ICE as all our remote offices are small and they do normally not call each other and in our main offices our PBX's are (still) internal ...
From: "Steven Ayre" <steveayre@gmail.com>
To: "FreeSWITCH Users Help" <freeswitch-users@lists.freeswitch.org>
Sent: Viernes, 11 de Enero 2013 13:34:15
Subject: Re: [Freeswitch-users] RTP traffic on LAn
Unfortunately FS does not (as yet) support it. At least not AFAIK.
It also would require that both endpoints support it too, and not all do.
In any case since FS is a B2BUA not a SIP proxy the endpoints are negotiating with FS not the other endpoint - so you're still going to want to detect that you want to (try to) bypass_media.
-Steve
On 11 January 2013 11:19, Raimund Sacherer
<raimund.sacherer@logitravel.com> wrote:
Hi,
isn't there allready a protocol that does that? ICE?
this is an excerpt from the SNOM wiki page (we have about 280 snom phones in action):
--- snip ---
ICE DESCRIPTION
Choose whether or not you want to use ICE (Interactive
Connectivity Establishment). ICE optimizes the media path. This would be
the case, for example, when two phones in the same network are calling
each other via a long media path through other, external networks. With
ICE, the short media path in the same network would be chosen, which
will presumably have better quality than the long one. Sometimes this
feature will stop you from being able to make calls. When this occurs,
switch it off.
--- snip ---
Link here:
http://wiki.snom.com/Settings/user_iceHere seems to be more information, check "Probing Media Path":
http://wiki.snom.com/Networking/NAT
Best,
Raimund
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