GRQ(General Request Message):一般请求消息
GSM(General forward Set-up Information Message):一般前向建立消息
ACM(Address Complete Message):地址全消息
ANN(Answer Signal, No Charge):应答消息,免费
ANC(Answer Signal, Charge):应答消息,计费
CBK(Clear-Back Signal):后向挂机消息
CLF(Clear-Forwad Signal):前向拆线消息
CCL(Calling Party Clear Signal):主叫挂机信号
RLG(Release Guard Signal):释放监护消息
SLB(Subscriber Local Busy Signal):用户市话忙
STB(Subscriber Toll Busy Signal):用户长话忙
LOS(Line Out-of-Service Signal):线路不工作消息
UNN(Unallocated Number Signal):空号消息
SST(Send Special Information Tone Signal):发送专用消息音消息
共有四种情况,如图(4.2-a)、(4.2-b)所示

(图4.2-a)

(图4.2-b)
ISUP基本术语注释:
IAM(Initial Address Message):初始地址消息
SAM(Subsequent Address Message):后续地址消息
INR:信息请求
INF:信息
ACM(Address Complete Message):地址全消息
CPG:呼叫进展
ANM(Answer Message):应答消息
SUS:暂停
REL(Release):释放
RLC(Release Complete):释放完成
CCL(Calling Party Clear Signal):主叫挂机信号
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