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Voice call is ok but Video call fail in the scenario of traversal between private and public networks

Publication Date:  2016-10-16 Views:  519 Downloads:  0
Issue Description

Voice call is ok but Video call fail in the scenario of traversal between private and public networks.The network topology is as below.

Handling Process

1,Voice call is ok,it seems the port and the configuration is ok,and normal also checked the media route is ok

2,Make a test for the standard scenario and try to find the root cause

a)TE desktop 1 call TE desktop 2 voice and video both are ok

b)But in the actual network,it is just voice call ok,so it seems it's network issue

c)Capture packets in the TE desktop 1,TE desktop 2 and SMC,it found caller send the invite message but the callee no response

3,Try to register via TLS and the video call is also ok in actual network

Root Cause

The root cause is that when use UDP mode to register and login,some big packets was cutted by network,and the gateway or firewall recognize the packet is abnormal then it will be discarded


Solution
Register SC via TLS mode
Suggestions

In the complicated network,we sugget to use TLS mode

END