PSTN/ISDN Emulation System Function and Construction
Huijun Li · Microcomputer Information · 2007
Based on a brief introduction about the PSTN/ISDN Emulation Subsystem- PES in NGN, the basic emulation functions of PES served for traditional fixed terminals in NGN is discussed in this paper, and the function, characteristics, construction as well as contrast between them are also discussed. The conclusion is indicated that the study on CS- based PES is more advanced than the that of IMS- based PES, while the IMS- based PES style is more suitable with the developing direction.