[OpenSIPS-Users] RTP proxy dialog impacted by async

Bogdan-Andrei Iancu bogdan at opensips.org
Mon Mar 11 03:26:45 EDT 2019


Shortly said, if you do rtpproxy_engage() *before* an async call, the 
create session is not triggered  ?


Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
OpenSIPS Summit 2019

On 03/08/2019 04:30 PM, Callum Guy wrote:
> Hi OpenSIPs Community,
> I wanted to report an issue I discovered when attempting to use the 
> rtpproxy module, using the dialog backed rtpproxy_engage() function. 
> Finding that it was not engaging in certain scenarios I took a closer 
> look at the activity on the control port and discovered that OpenSIPS 
> never sent a request to open the session in this scenario.
> To help illustrate, here is an example control port sequence of a 
> properly engaged call:
> 65098_11 *UR*,8,0,3,101,13 */the-call-id/* 
> 10248 */from-tag/*;1
> 65118_19 *LR*,101 */the-call-id/* 10248 
> */from-tag/*;1 */to-tag/*;1
> In my scenario the *UR* (create session) request was never received. 
> Without claiming any expertise on the rtpproxy protocol this was 
> clearly not correct and the *LC* (update session) request could not 
> locate a session to act on.
> Following a fairly lengthy investigation I traced the issue back to my 
> usage of the async() function where i was issuing the 
> rtpproxy_engage() request before calling async for another purpose. 
> The solution was simply to move the rtpproxy_engage() call to after 
> the async method.
> I'm happy that the issue is resolved for my requirements however I 
> thought I would share the experience to the list in case others found 
> themselves having a similar issue.
> Thanks!
> Callum
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