Original sentence: 3GPP release 7 added support for fixed networks, by working together with TISPAN release R1.1, the function of AGCF(Access Gateway control function) and PES(PSTN Emulation Service) are introduced to the wire-line network for the sake of inheritance of services which can be provided in PSTN network
Edited sentence: 3GPP release 7 added support for fixed networks, by working together with TISPAN release R1.1, the function of AGCF(Access Gateway control function) and PES (PSTN Emulation Service) are introduced to the wire-line network for the sake of inheritance of services which can be provided in PSTN network