Modeling and Performance Analysis of Telephony Gateway Registration Protocol

Telephony gateways are devices that interface between IP telephony networks and the PSTN. A telephony proxy or Location Server (LS) that attempts to connect a call for an end user may need to choose between multiple candidate gateways. Gateways need to send updates of their dynamic resource information periodically to the LS which are used by LS while choosing a gateway. Telephony Gateway REgistration Protocol (TGREP) is an IETF proposed standard used by gateways for this purpose. To the best of their knowledge, there is no study done on the performance of TGREP and the authors believe that this is the first paper on performance modeling of TGREP system.