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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