Hi Tarun
Here is the flow which i have seen in one of the deployments:
Fixed IMS client calling Volte Subs:
Incoming Invite if having QOS params ,local would be met already
with a:sendrecv.
So Volte end can send 183 sdp to get its local side qos met.And then
180 ringing
after precondition met .On getting 180 , caller can hear local
ringback tone.
Fixed IMS client calling VoWifi Subs :
Both end dont need precondition here so 180 can be sent immediately
by VoWifi end
after getting Invite. On getting 180 , caller can hear local
ringback tone
Do you mean, Fixed IMS caller always wait for remote ringback tone ?
Why local end DSP resources not used to play local ringback tone on getting
180 ?
Regards
Ankur Bansal
On Fri, Sep 23, 2016 at 4:20 PM, Tarun Gupta <tarun.gu...@ericsson.com>
wrote:
> Hello all,
>
> It has been observed whilst testing our WiFi/VoLTE solution that when a
> Fixed IMS service (such as Broadband voice or SIP Trunking) CPE calls one
> of our WiFi/VoLTE subs, they do not hear any ring back tone as call setup
> progresses. It transpires that this is because our VoLTE UE's always
> reliably send an SDP in the 183 Session Progress which means that the Fixed
> IMS service CPE's sit there waiting for the remote endpoint to provide
> early media ring back tone which of course will never come from the VoLTE
> UE's.
>
> Has anyone experienced this in their deployments and if yes, what
> solutions were put in place to fix this? (for example network provided RBT?
> removing preconditions?)
>
> Regards
> Tarun Gupta
>
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