On Wed, Aug 18, 2021 at 1:30 PM Antony Stone < Antony.Stone@kamailio.open.source.it> wrote:
On Wednesday 18 August 2021 at 13:40:25, David Villasmil wrote:
In freeswitch you have the uuid_hold, etc api:
https://www.freeswitch.org/confluence/plugins/servlet/mobile?contentId=1966
741#content/view/1966741
You call the API uuid_hold [uuid] or uuid_hold off [uuid] to take the channel out of hold.
UUID in freeswitch is what uniquely identifies a given channel.
But, would that not perform the hold function on the FreeSwitch server?
Yes, if your app doesn't support it, you can't expect it to do it, right? You would call the API uuid_kill on the B-leg of your call, meaning the leg connected to the PBX.
And, if after putting it on hold, I need to transfer a call to another number / channel, that transfer would also take place on the FreeSwitch server?
Correct
Or am I misunderstanding, and FreeSwitch can pass the instruction to "place the call (channel if you prefer) on hold" on to the PBX system which my existing client application is placing its calls through?
Correct.
In effect, your app would call into freeswitch and then in freeswitch you would do anything your app can't do. Everything from FS' point of view.
When you say:
“However, my understanding of a B2BUA is that *it* would then start handling the state of the calls itself - whether they're on hold, routing the transfers, etc.”
This is correct, that’s how B2BUA works, but you can send an API to fs
via
ESL (tcp connection on port 8021) to put on hold not just your channel, since that would simply send a reconly to your app, but also the B-leg of the call.
This all sounds as though I am getting FreeSwitch to "do the work" and manage the hold/transfer/resume/conference/whatever itself. I could do that with Asterisk (which I already know, whereas I haven't used FreeSwitch), but it isn't a solution to my needs.
I need something which will *tell the existing PBX* to do these things (and it's probably not running FreeSwitch), in just the same way as pressing the buttons on a competent SIP phone such as Yealink or Polycom would tell the PBX to do it.
Antony.
-- The Magic Words are Squeamish Ossifrage.
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