通话建立（手机作被叫
信令过程
RR层连接建立CCCH—DL：PAGING_REQUEST
RACH—UL：CHANNEL _REQUEST
AGCH—DL：IMMEDIATE_ASSINGMENT
MM层连接的建立SDCCH—UL：PAGING_RESPONSE
SDCCH—DL：AUTH_REQUEST
SDCCH—UL：AUTH_RESPONSE
SDCCH—DL：CIPHERING_REQUEST
SDCCH—UL：CIPHERING_COMPLETE
CC层连接的建立SDCCH—UL：SETUP
SDCCH—UL：CALL _CONFIRMED
SDCCH—UL：ALERTING
SDCCH—UL：CONNECT
SDCCH—DL：ASSIGNMENT_COMMAND
SDCCH—UL：ASSIGNMENT_COMPLETE
SDCCH—DL：CONNECT_ACKNOWLEDGE
紧急呼叫
信令过程
RR层连接建立RACH—UL：CHANNEL _REQUEST
AGCH—DL：IMMEDIATE_ASSINGMENT
MM层连接的建立CCCH—UL：CM_SERVICE_REQUEST
CC层连接的建立SDCCH—UL：EMERGENCY_SETUP
SDCCH—DL：CALL _PROCEEDING
SDCCH—DL：ASSIGNMENT_COMMAND
SDCCH—UL：ASSIGNMENT_COMPLETE
SDCCH—DL：ALERTING
SDCCH—DL：DISCONNECT
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