Hi, could you please provide the /var/log/ngcp/rtp.log for one such call? Regards, Andrew On 03/18/2015 09:43 AM, H Yavari wrote: > Hi, > > Thank you for this offer. > I did the update but problem not solved. I tested different scenarios > but they had same issues. (No audio or SDP bad description) > > Regards, > > H.Yavari