Dear Sir/Madam, I need some assistance.We are developing a mobile Apps. The apps has module for chat which consists of audio and video. I am using Linphone for client and Kamailio for SIP Server. When we tested it works in the same wifi only. Does not work in 3g/4G or different wifi networks. Text is ok. Audio call is connected but can't hear audio in both sides. Same for video. It is processing for very long. Please assist on this. Thanks SamG DS Media http://www.dsmedia.com.sg https://www.youtube.com/user/Dsmediatv