Can you check user B, is there another line 1111?

Change T302 or add # to route pattern like 00!#,After  dialing number, press #.

Can you post your configurations of both CME-A& CME-B?As Chris mentioned,for allow sip to sip or h323 to h323, you can configure:voice service voip allow-connections h323 to h323 allow-connections h323 to sip allow-connections sip to h323 allow-conn...

Hi,Maybe your cme is running on a 15.X ios?try this:voice service voip ip address trusted list  ipv4 0.0.0.0 0.0.0.0  ipv4 X.X.X.X 255.255.255.255 no ip address trusted authenticate allow-connections h323 to h323 allow-connections h323 to sip allow-c...

Yes you are right.