: Dialtone not present in BRCM after adding user from Juci

To fix the issue,at time of off-hook we are checking for the registration state and playing a tone accordingly. Removed the subscribe and unsubscribe callback for register.

The test cases executed are : 1- Caller A calls Callee B Result: Call success 2- Caller A calls Callee B ,B Is Busy Result: A Gets a busy tone, Success 3- Caller A call Invalid Number Result: get congestion /busy tone, Success 4- Caller A calls B ,B picks,B holds the call ,B unhold ,B terminate Result: Call success 5- Caler A calls B,B holds and adds C ,B press 3 and all three party are in call Result: Call success 6- Caller B dials 21c# ,A calls B ,call goes to C Result: Call success 7- From Juci Add a subscriber Result: Dial tone is heard once it's registered, Success 8- From Juci Add an invalid subscriber Result: No dial tone,Success 9- From Juci Delete a valid subscriber Result: No dial tone, Success 10- Delete an invalid valid subscriber Result: No dial tone, Success 11- Reload brcm with valid subscriber Result: Dial tone is heard, Success 12- Add a valid user,reboot the dut Result: dial tone on reboot complete, Success 13- User re-registers after the register expires Result: Dial tone present, Success 14- Add a valid number, tone should be heard.Make the subsequent register fail-No dial tone , Success