I have 2 Tandberg Units. C20 and EX90. I am trying to establish a call between them over the internet. I made the required NAT. and also configure the callsetup to direct and the NAT address on both units. when i establish a call, i get the ringing on the other side but when i accept the call is dropped.
Yes, there is no VCS in the middle. thats direct call between them. after I edited some setting i can get audio only now and from call status i can see that audio negotiation is done and the audio codec is g711. but for the video codec, it is not negotiated.
There is no need of VCS in this call setup , you just need to open Media Ports on your firewall so that call signalling and Media can flow through.
I would like to suggest please check the firewall settings at both the ends since there need to be some ports open on the firewall for this to work. The port numbers that are needed to be opened on the firewall are as follows:
For H.323: • Gatekeeper Discovery (RAS) – Port 1719 – UDP • Q.931 call Setup – Port 1720 – TCP • H.245 – Port Range 5555-5574 – TCP • Video – Port Range 2326-2485 – UDP • Audio – Port Range 2326-2485 – UDP • Data/FECC – Port Range – 2326-2485 – UDP
For SIP: SIP messages – Port 5060 – UDP/TCP • SIP messages – Port 5061 – TLS(TCP) • H.245 – Port Range 5555-5574 – TCP • Video – Port Range 2326-2485 – UDP • Audio – Port Range 2326-2485 – UDP
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