4.ADI 地址不全信号(Address incomplete signal)
5.ANC 应答信号、计费(Answer signal, charge)
ANN 应答信号、免费(Answer signal, no charge)
ANU 应答信号、计费未说明(Answer signal, unqualified)(暂不使用)
BLA 闭塞证实信号(Blocking-acknowledgement signal)
BLO 闭塞信号(Blocking signal)
BSM 后向建立消息(Backward set-up message)
CBK挂机信号(Clear-back signal)
CCF 导通故障信号(Continuity-failure signal)
CCL 主叫用户挂机信号(Calling party clear signal)
CCM 电路监视消息(Circuit supervision message)
CCR 请求导通检验信号(Continuity-check-request signal)
CFL 呼叫故障信号(Call-failure signal)
CGC 电路群拥塞信号(Circuit-group-congestion signal)
CHG 计费消息(Charging message)(暂不使用)
CLF 拆线信号(Clear-forward signal)
CNM 电路网管理消息(Circuit network management message group)
COT 导通信号(Continuity signal)
CSM 呼叫监视消息(Call supervision message)
DPN 不提供数字通路信号(Digital path not provided signal)
EUM扩充后向建立不成功信息消息(Extended unsuccessful backward set-up information message)
FAM 前向地址消息(Forward address message)
FOT前向转移信号(Forward-transfer signal)
FSM 前向建立消息(Forward set-up message)
GRA 电路群复原证实消息(Circuit group reset-acknowledgement message)
GRM 电路群监视消息(Circuit group supervision messages)
GRQ 一般请求消息(General request massage)
GRS 电路群复原消息(Circuit group reset message)
GSM 一般前向建立信息消息(General forward set-up information message)
HBA 面向硬件故障的群闭塞证实消息(Hardware failure oriented group blocking-acknowledgement message)
HGB 面向硬件故障的群闭塞消息(Hardware failure oriented group blocking message)
HGU 面向硬件故障的群闭塞解除消息(Hardware failure oriented group unblocking message)
HUA 面向硬件故障的群闭塞解除证实消息(Hardware failure oriented group unblocking-acknowledgement message)
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