Abstract This project represents the simulated model of voice over IP in Mobile communications. In the Global System for Mobile Communication (GSM) infrastructure the signaling entities like Mobile Switching Center (MSC), Visitor Location Register (VLR) and Home Location Register (HLR) uses Mobile Application Part (MAP), which sits on the top of Transaction Capabilities Application Part (TCAP) of Signaling System no. 7. The current GSM infrastructure uses MAP and TCAP part of SS7 for...