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Knowledge Base

TE30 video and Audio

Publication Date:  2019-07-27  |   Views:  509  |   Downloads:  7  |   Author:  g00733473  |   Document ID:  EKB1000033825


Issue Description

1. When in a conference one site does not show remote video
2. When in a conference one site shows video but there is no audio
3.Call hangs up after 30 seconds automatically

Alarm Information

No data streams have been received from the remote site for 10 seconds. The call will end in 20 seconds.
No data streams have been received from the remote site for 20 seconds. The call will end in 10 seconds.
The call has ended properly.

Handling Process

After I checked the logs and they showed me that nothing was wrong, I changed the default call bandwidth and put it at its lowest but still the problem persisted, I then checked the call status again and saw that I had not been receiving video from the remote site, I checked the conference parameters and local IP’s and they were all consistent. I then logged into the TE30 and run command mc cfg nomediahang 0 to disable the function to automatically hang up if it has not received data streams from remote side, I then logged into both the TE30’s and run the command h323c h323GlbCfg  h and when I checked the parameters the one TE30’s IP was the actual IP I had set and on the other TE30 it was getting the wrong IP which was *.*.*.*, which is a public IP, I went to settings under the firewall tab I checked in NAT and found that NAT was enabled and that the TE30 was getting a public IP instead of a private. I then disabled NAT and tried to call again and all was working perfectly.

Root Cause

After seeing the alarms on the display, I went to check to the call status of the active point to point call, and when I analyzed the actual call status it showed that I was not receiving any video from the remote site but I was receiving audio streams, I decreased the call bandwidth but the problem still persisted.


When you install and configure the TE30 or other VC equipment. On a private network you must make sure that NAT is disabled unless you want to connect to a outside network only then you can configure NAT but always remember that for security reasons you should always dial the public network, not the public network dial into your private network.