I have been working for a new age service provider for over 3 years. Since last 2 years, I am part of the team responding to RFP's for modernizing major service provider networks including staging, testing and deployment of 4G/LTE services.I have been following the 4G/LTE trends at TMForum and other related information sources since then. History ======== In the mid-70's Telecom networks underwent a important change, they introduced the common channel signalling to break-away from physical network path to virtualizing the call setup. This was enabled by a relatively open standard called Signaling System No. 7 (SS7). According to Wikipedia - "SS7 is a set of telephony signaling protocols which are used to set up most of the world's public switched telephone network telephone calls. The main purpose is to set up and tear down telephone calls. Other uses include number translation, prepaid billing mechanisms, short message service (SMS), and a variety of other mass...