In a VC+IVS convergence conference, after a
conference is held on the VSD, a message is displayed, indicating that the
preview channel is not ready and the preview fails.
The version information is as follows:
1. Log in to the SMC2.0 web page and check whether the cgw site in the
conference list has joined the conference.
If the cgw site joins the conference (as shown in the following
figure), the SIP configuration of the MCU is correct.
2. Check whether the PC where the vsd is located has dual network
If the PC has dual network adapters,
choose Management > Configuration
> Local Terminal Parameters on the vsd and select the local terminal IP address as the IP
address for interworking with the MCU.
3. Check whether the system SIP software, such as espace and sip
server, is installed on the PC where the vsd is located.
If the system SIP software is installed on the PC, first end the
related processes, then restart the vsd or replace the PC with another PC to
install the vsd.
On the PC, check whether the system SIP software is installed as
1. On the cmd CLI, run the netstat –ano|findstr 5060 command to
obtain the PID of the process that occupies port 5060. As shown in the
following figure, the number in the last column is the process ID.
2. Open the Task Manager, choose View > Select Column, and select
PID. In the process list of the task manager, sort the processes by PID. The
process whose ID is occupied can obtain the process that occupies port 5060.
in to the SMC2.0 web page and check that the cgw site in the conference list has
not joined. Log in to the MCU and check the SIP configuration. It is found that
the Transmission type is TLS and the Port (1000-65535) is 5061.
Change the Transmission type to UDP and Port (1000-65535) to 5060.
The problem is solved.