[Freeswitch-users] Ring Group with Video Preview

Antony Stone Antony.Stone at freeswitch.open.source.it
Wed Dec 28 09:22:36 UTC 2022

On Wednesday 28 December 2022 at 02:19:30, Jerry Kendall wrote:

> Typo...
> the last line should be
> if I set 'bridge_early_media, then all devices will accept the video howeve
> r, the video is simply a blank screen with *no* content- basically a black
> screen

You're basically expecting to be able to convert unicast traffic into multicast 
(unicast means one device sending IP to one other device, multicast means one 
device sending IP to many devices) and although this may be possible, it's (a) 
not automatic, and (b) not something that FreeSwitch will do for you, to the 
best of my knowledge.


> On 12/27/2022 1:58 PM, Jerry Kendall wrote:
> > Hi Antony,
> > 
> > Yes, it does work with one device in the ring grouop.
> > 
> > In fact, if I toogle or change the devices within a ring group it works
> > regardless of which device - as long as it's only one device in the ring
> > group. Once there are more than a single device, the the video preview
> > only works on the first device to reply with a '183 progress...' All the
> > other devices get a cancel as FS gets the 183 and cancels all other
> > devices... even if they send a '183 progres...'
> > 
> > if I set 'bridge_early_media, then all devices will accept the video
> > however, the video is simply a blank screen with on content
> > 
> > Jerry
> > 
> > On 12/27/2022 12:40 PM, Antony Stone wrote:
> >> On Tuesday 27 December 2022 at 18:32:58, Jerry Kendall wrote:
> >>> Does anyone have experience with ring groups that show a preview (on
> >>> all video capable phones) of a door phone?
> >> 
> >> I somehow doubt that it is possible to send a preview to a ring group.
> >> 
> >> That's verging on video-conferencing, after all.
> >> 
> >>> I have Fanvil (V67/I53W) and Grandstream video phones (GXV3480/GXV3240)
> >>> connected to Fanvil(I64) and Axis(A8207) door phones.
> >>> 
> >>> the door phones are able to send preview and the phones are able to
> >>> receive previdw but the screens only show a black image - no live
> >>> video.
> >> 
> >> Have you tried reducing the configuration to a simple setup of one door
> >> phone and one video phone, to see whether a preview can be
> >> sent/received like that?
> >> 
> >> If that works, do a packet capture and look at the SDP part of the SIP
> >> communication, and then compare with the same thing using a ring group.

Late in 1972 President Richard Nixon announced that the rate of increase of 
inflation was decreasing.   This was the first time a sitting president used a 
third derivative to advance his case for re-election.

 - Hugo Rossi, Notices of the American Mathematical Society

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