11.三方通话 Three Party Service ( TPS )
<5290:DN=K'xxxxxxx,TPS=1&2.
TPS=0 --撤销
A Connert B
A: RR + SDT + K'C
B in hold, A&C in Conversation
Then: A can RR+0 to release B ,keep connect to C
RR+1 to release C,back to B
RR+2 to Switch between B&C
RR+3 to connect A&B&C
12.会议电话 ADD on Conference (ADDCONF)
<5290:DN=K'xxxxxxx,CONF=1&3.
CONF=0 --撤销
A: hook-off DT *43# SDT B
A: RR SDT *43# SDT C
A: RR SDT *43#, A&B&C
A: RR SDT *43# SDT D
A: RR SDT *43#, A&B&C&D