You would probably save more bandwidth by switching to a lower bandwidth codec. IAX trunking only reduces bandwidth wasted by IP headers of individual RTP streams, by combining multiple small RTP packets (from different RTP streams) into larger packets. It does not do anything magical to the RTP data itself. This is only useful if all those RTP streams are going to the same destination of course. With SIP, you could try increasing the packetization delay from the usual 20 or 30ms up to something like 120ms. This means more RTP data gets packed into a single packet, and hence fewer of them are required in any given RTP stream. It does have side effects however - if your link is not reliable enough, and you lose the occasional packet, that's 120 ms of audio you just lost - probably quite noticeable. Depending on the jitter buffer being used, it may also want at least a few packets in the buffer before it starts playing audio. If 3 x 120ms packets is what it wants, there will be a 360ms delay at the start of the call before the first audio is heard. On Wed, 2008-06-18 at 11:36 +0200, David Villasmil wrote:
Thanks for the reply,
I was just curious because we have many gws doing IAX trunking to save bandwidth as the gws are behind ADSL.
Thank you again.
d
On Wed, Jun 18, 2008 at 11:18 AM, David Knell <dave@3c.co.uk> wrote: Hi David,
I believe the answer to be 'no' - the workaround we use is to run * and FS on the same box, and have * act as an IAX<->SIP gateway. Works fine, but probably restricts capacity in the limit.
Cheers --
Dave > Can FS do IAX Trunking? > > David > > > ____________________________________________________________ > > _______________________________________________ > Freeswitch-users mailing list > Freeswitch-users@lists.freeswitch.org > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users > http://www.freeswitch.org >
-- David Knell, Director, 3C Limited T: 020 8114 8901 F: 020 3002 7257 M: 001 415 630 3031 http://www.3c.co.uk
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