WOWMOM '99 Proceedings of the 2nd ACM international workshop on Wireless mobile multimedia
IEEE Communications Magazine
iGSM: VoIP service for mobile networks
IEEE Communications Magazine
VoIP mobility in IP/cellular network internetworking
IEEE Communications Magazine
Reducing the network cost of call delivery to GSM roamers
IEEE Network: The Magazine of Global Internetworking
Realizing mobile wireless Internet telephony and streaming multimedia testbed
Computer Communications
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Internet telephony and mobile telephony are both growing very rapidly. Directly interworking the two presents significant advantages over connecting them through an intermediate PSTN link. We propose three novel schemes for the most complex aspect of the interworking: call delivery from an Internet telephony (SIP) terminal to a mobile telephony (UMTS) terminal. We then evaluate the proposals both qualitatively and quantitatively. However, existing equipment may not support packet interfaces needed for such interworking. Therefore, we also consider techniques for backward compatibility, and analyze their performance as well.