Simon,

you should probably enable debugging on Linphone and check what it does when 
you hold the call. It should send out a reINVITE with a=sendonly in the SDP 
(and Linphone also adds a “Subject: Call on Hold” to the SIP headers).

Germán


> On 25 Apr 2021, at 20:39, Simon Edwards <[email protected]> 
> wrote:
> 
> I have a new deployment of linphone <—> Freepbx<—>Sangoma SBC<—> Sipgate SIP 
> trunk.
> 
> So far everything seems to work as expected, except when I make an outbound 
> (external) call from linphone, but then wish to put the called party on hold. 
> I put the call on hold, the called party doesn’t get MOH, and I can’t get the 
> call back. It ends up either dropping the call, or I have to hang up the 
> linphone client.
> 
> Looking at the SIP trace from FreePBX, I can’t see where the Linphone client 
> signals to put the call on hold, so I’m wondering if there is a bug or 
> something?
> 
> Inbound calls to the linphone client can be put on hold, MOH is delivered, 
> and I can get the call back.
> 
> Thanks
> 
> Simon
> 
> Sent from my iPad
> _______________________________________________
> Linphone-users mailing list
> [email protected]
> https://lists.nongnu.org/mailman/listinfo/linphone-users


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