Hi all, I'll make this question a little clearer. User 1 ---------------- SBC ----+ other IMS network components ---------------------- User 2 Same scenario User 1 Making the call + plays RTP Traffic User 2 Answering the call + records the RTP Traffic coming from User 1 and does a PESQ voice quality analysis If user 2, after answering the call, did not play RTP as well, the SBC will not forward the RTP from User 1 to User 2. [The media gateways responsible for the RTP traffic is also a part of the IMS network right?] So why this sort of bi-directional traffic imposition in an IMS Network ? Thanks, Badri. -----Original Message----- From: Badri Ranganathan Sent: 24 February 2015 15:13 To: sr-users(a)lists.sip-router.org Subject: Regarding RTP in IMS Networks. Hi all, I have a doubt w.r.t media traffic in IMS Networks. If I have a setting as follows - User 1 Making the call + plays RTP Traffic User 2 Answering the call + records the RTP Traffic coming from User 1 and does a PESQ voice quality analysis I see that User 2 has to play RTP Traffic before it can start recording the RTP coming from user 1. i.e., User 2 Answering the call + (Play RTP Traffic ) + records the RTP Traffic coming from User 1 and does a PESQ voice quality analysis. Why am I seeing this behaviour. Is it just a setting in the IMS network that can be changed or is it a standard behaviour in IMS Networks ? If yes, then could anyone please let me know the logic behind such a decision? Please do let me know if you have any ideas. Any responses really appreciated ! Thanks, Badri. _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users(a)lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users