This post particularly describes the gateways in IMS which communication back and forth with a legacy endpoints.To get a overview of IMS itself click here  and to get a detailed description of IMS and its architecture click here .

What is IM-SSF  ?

IP Multimedia Service Switching Function is a  gateway to provide IN service such s legacy VPN ( Virtual Private Network ).



What is R-IM-SSF  ?

Reverse IP Multimedia Service Switching Function Works on reverse principle to connect IN network  to IMS services using IMS services such as FMFM ( find me follow me ) .


More link on telecom transformation , migration and inter-opereability :

Transformation towards IMS 


thoughts on a Fullproof communication platform

How easier would it be if there was a infrastructure that could connect all devices all communication protocols , old legacy PSTN phones , vOIP  ones like  SIP all the PBXs of the worlds , GSM handsets even the very new WebRTC .

I have assembled my thoughts of a ideal communication platform in this blog-post , it involves GSM PLMN PBX IP with their respective gateways , meeting at a particular point which understand all protocols and provides a single registry service for telecom network operations like OSS , BSS ( I haven’t gone into too much of those details , since it spoils the fun ) .


GSM PLMN PBX IP webrtc h323

Embedding a bit from NGN ( next generation network) , since I like the concept of softswitch ( Signalling gateway +   Media Gateway controller )  .

All the above should connect to an IP network . why ? Because the future lies in IP telephony . Also because it becomes easier to make provisioning system for the admin to add new policies , review real-time statistics and for the users to avail new servers and customize their services settings any time .


Ofcourse there will arise codec inter- operability issue s, firewall ICE issues so on … yet all great inventions start with an idea , dont they 🙂