Issue about VOIP

Good afternoon,

We have a gvc3200 cn firmware 1.0.3.36 in the city A and we have another gvc3200 with a Firware 1.0.3.24 in the city B. The two offices communicate through a VPN. In A city we have a pbx umc6102 and in B city we have a pbx elastix. In both pbx we have sip extensions and a sip trunk to communicate both pbx, also both pbx are allowed the use of video and audio codecs so that the gvc equipment can transmit audio and video. In A we have a firewall router fortigate 90D and in B We have a zywall usg 20. The problem is the following:

Audio Sip call: From A to B and vice versa you can successfully transmit audio Ip call: From A to B and vice versa you can successfully transmit audio

Video

Sip call: From A to B you can not show video is more nor does it sound like you're calling the other equipment. From B to A you get both audio and video

Ip call: From A to B you can not show video is more nor does it sound as if you were calling the other equipmente. From B to A, the screen goes out that if we want audio or video or reject, and the option does not work neither audio nor video, only the option to reject works.

Both gvc computers are registered in their respective PBX. We also did a test to change the protcoloc sip to H323 and successfully left either from A to B and vice versa.

We do not know what more tests to do, if only audio works well from there video for nothing.

We wait your answer Beforehand Thank you