以下哪个功能实体_位于PES（PSTN/ISDN仿真业务）子系统中，与终端、PES中其它实体及其它NGN子系统有接口？
Which functional entity as following is located in the PSTN/IDSN Emulation Service subsystem,and it has standard interfaces for accessing terminals, other PES functional entities, and other NGN subsystem?
发布于 2021-02-04 18:00:28
【单选题】
A CSCF
B MGCF
C AGCF
D SSS
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