Hello, I am trying to establish a video call from a linPhone to a Polycom device. Polycom is configured as an external gateway device on my Freeswitch. I have tried several tests and I have added the H264 configuration in file modules.conf.xml : <load module="mod_h26x"/> and also in vars.xml: <X-PRE-PROCESS cmd="set" data="global_codec_prefs=OPUS,G722,PCMU,PCMA,H264,VP8"/> <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=OPUS,G722,PCMU,PCMA,H264,VP8"/> I am now able to establish the call from linphone to Polycom but only audio is established. I have looked at SIP trace with wireshark and the 200OK that is send back from Freeswitch to LinPhone has only VP8 in the SDP. Linphone -----> Invite (VP8, H264) -----> Freeswitch -----> Invite (VP8, H264) -----> Polycom <----- 200OK (VP8) <----- <----- 200OK (H264) <---- I have tried different configuration without success. Do you have an idea of what may be missing to have H264 in the 200OK instead of VP8 ? Or is there another solution ? Thanks in advance for your help Fred