P2P half-duplex call is failed ,all other full-duplex calls are normal

Issue Description：

P2P half-duplex call is failed ,all other full-duplex calls are normal

Handling Process：

1. check the license switch.

2. check whether the BTRUNK function was open:  LST BTRUNCFUNC:; 

3.open a trace item from the user side, there is no any message in TSN

4. According to the analysis of the eAPP log, the user also started the service in POC way, not PTT way

5. from the user trace, there is no user trace sent by USN

6. according to the detailed user trace, there is no BTUNK license item.

Root Cause：

 the license file is not right, and need to apply again, the PTT function need to be included

Solution：

apply for the new license using the TD-tech template again, the PTT function need to be included.