[OpenSIPS-Users] Fwd: pre-alerting announcement by modifying the prepaid B2B UA scenario

[Bogdan-Andrei Iancu]

Hi Ano,

But the prepaid example already has an pre-call announcement - so what 
are you trying to change ?

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   http://www.opensips-solutions.com
OpenSIPS Bootcamp 2018
   http://opensips.org/training/OpenSIPS_Bootcamp_2018/

On 10/05/2018 09:32 AM, Ano Nemo wrote:
> Hi all,
>
> I am trying to implement pre-alerting announcement by modifying the 
> prepaid B2B UA scenario.
>
> If I am not mistaken the default prepaid B2B UA scenario looks as below:
>
>
>    A Party                    OpenSIPS                 MS       B Party
> 1. ----Dialog1:INV+SDP(offer)--->
> 2. ----Dialog2:INV+SDP(offer)---->
> 3. <----Dialog2:200+SDP(answer)---
> ------------------------------- Bridging 
> -------------------------------------
> 4. <----Dialog1:200+SDP(answer)---
> 5. ----Dialog1:ACK--------------->
> 6.  ----Dialog1:ACK-------------->
> ------------------------------- Announcement 
> ---------------------------------
> 7. <----Dialog2:BYE---------------
> 8. -------------------Dialog3:INV+SDP(offer)-->
> 9. <------------------Dialog3:180 -------------
> 10 <------------------Dialog3:200 -------------
> 11  -------------------ACK-------------------->
> ------------------------------- Bridging 
> -------------------------------------
>
>
> I am having problems with this behavior because in the prepaid 
> scenario, the opensips B2B UA will create a leg to B party only after 
> it has received a BYE from the MS. This means that there has to be a 
> 200 OK before that which needs to reach the A party and establish media.
> The behavior I am aiming for is for the MS to deliver an provisional 
> response with SDP (183) to A Party and play the announcement. However, 
> after an 183, I cannot terminate the call from the MS with a BYE and 
> also, I do not want to generate a 200 OK. But I could generate an 
> error on the MS (say an 4xx error).
> So, the question is, can the scenario xml rules be formulated to make 
> the B2B UA act on negative response? Is the below possible?
>
> <rules>
> <reply><negative> or  <410>
>
> <ruleid=”1”>        ... </rule>
> </negative> or  </410>
> </reply></rules>
>
> If not, is there any other way to do this?
>
> Regards,
> Ano
>
>
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