Abstract— From the earlier analog phone to smart phone for each person now, from analog to digital voice transmission, the fast-rising VoIP has reached an unprecedented peak in nowadays of flourishing smart phone. However, the analog phone technology has been mature, stable and of high penetration rate. This paper introduces the technology of integrating IP PBX and analog phone via VoIP gateway based on SIP protocol, so as to realize Telephone Mobility. It could convert the analog phone to be a part of extension either at home or company or anywhere. Through implementing the system, it’s found the Dial Plan can make analog phone communicate with the extensions within the original PBX, but also be converted into an extension to call other extensions in the company through VoIP. When making PSTN Calls on outside, the call will go through the office external line via VoIP to avoid additional telephone bills from hotel, it is unnecessary to need to access the software IP phone in your PC. Such application will provide a solution to speed up the integration of VoIP and analog phone, it able to get security guaranteed when voice call through VPN Tunnel on Internet.

Index Terms— VoIP gateway, IP PBX, SIP, telephone, mobility, dial plan.

Lin Jia-Ching and Sun Pei-Chen are with Dept. of Information and Computer Education, National Kaohsiung Normal University, Taiwan (email: felix914@gmail.com, sun@nknucc.nknu.edu.tw).

Cite: Lin Jia-Ching and Sun Pei-Chen, " The Application of Telephone Mobility Gateway Based on VPN Tunnel," International Journal of e-Education, e-Business, e-Management and e-Learning vol. 4, no. 1, pp. 1-5, 2014.