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I have configured SIP trunk with authentication. the authentication is username and password. I use CUBE to acheive this.
the call flow is like the following
phone ---> CCM 6.1 -----> H323 ----> CUBE -----> Firewall -----> Internet ------> SIP provider.
while I do troubleshooting, I found a message told me that the firewall traversal is not enabled.
I do stun configuration by using the following commands
voice sevice voip
stun flowdata agent-id 10
voice class stun-usage 1
stun usage firewall-traversal flowdata
after that, the firewall traversal message disappear from the logs. but the call is not working.
the sip provider has a STUN server, how we can use it ? and also what is the STUN ?
thanks in advance