[OpenSIPS-Users] question about rtpengine_manage() in failure_route

[Răzvan Crainea]

Hi, William!


Make sure you call rtpengine_manage() in branch route, not in the 
request route, otherwise all the changes will be inherited throughout 
all the branches further created.


Best regards,

Răzvan


On 6/9/20 7:04 AM, William Jin wrote:
> Below is a short config example.
>
> route {
> ...
> setflag(CallFWD);
> rtpengine_manage();  #say the first call attempt need rtpengine
> t_on_failure("handle_failure");
> r_relay();
> ...
> }
>
>
> failure_route[handle_failure] {
> ...
> if (isflagset(CallFWD)){route(handle_callfwd);}
> ...
> }
>
> route[handle_callfwd]{
> ...
> xlog("L_INFO","RB=$rb(application/sdp)");
> if (t_relay()){
> xlog("L_INFO","Stateful relay done. RB=$rb(application/sdp)");
> }
> ...
> }
>
> Looks like the t_relay in the handle_callfwd will inherit the SDP info 
> that rtpengine_manage entered in the first attempt.
>
> Also, another interesting fact is that the SDP info is added while the 
> t_relay is called. Looks like the t_relay is using its data in memory 
> and re-write the SDP. the $rb(application/sdp) is not changed until 
> the t_relay is called.
>
> How can I, for example, remove the rtpengine related SDP for the 
> second INVITE generated by the failure_route?
> I tried rtpengine_delete() in handle_callfwd or rtpengine_manage() in 
> the failure_route which suppose to do rtpengine_delete also, but they 
> don't work as expected.
>
> Thanks in advance.
>
>
> --
> Regards,
> William Jin
> ------------------------------------------------------------------------
> *From:* Users <users-bounces at lists.opensips.org> on behalf of William 
> Jin <williamj at exetel.com.au>
> *Sent:* Tuesday, 9 June 2020 9:09 AM
> *To:* OpenSIPS users mailling list <users at lists.opensips.org>
> *Subject:* [OpenSIPS-Users] question about rtpengine_manage() in 
> failure_route
> Hi All
>
> May I know how can I rewrite the SDP (rtpengine) in the failure route?
>
> The scenario is we use rtpengine_manage() in the first call attempt, 
> if it fails, it uses failure_route, however, we want to change the SDP 
> info.
>
> For example, the call's first attempt is to an ipv6 UAC, when failed, 
> we try ipv4 UAC. We need to change the rtpengine address-family to IP4 
> so the c= line can follow with an IPv4 address.
>
> We tried to use rtpengine_manage("address-family=IP4"), but looks like 
> the SDP still not changed.
>
> Does anyone have any idea about this? Or is there any other way to 
> achieve this?
>
>
>
> --
> Regards,
> William Jin
>
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