handoff. This offers a converged voice solution resulting in munication costs, increasing efficiencies and introducing new, enhanced capabilities to general users. This is feasible in experimental environments. References 1.Ravishankar, Ravi. “ Voice over Wireless LAN ”. Telephony Packet In. November 2002. / 2.O.Granberg, ” GSM on ”, Ericsson Rev.,no.4, 1998, pp.184-91 3. Herman C. H. Rao, Yi-Bing Lin and Sheng-Lin Cho, ``iGSM: VoIP Service for works'', m. Magazines, Apl. 2000 4. ITU-T, Rec H.323: Packet Based munication Systems, Feb,1998 5. IETF RFC2543,SIP: Session Initial Protocol, 1999 6. cisco-understanding h.323 gatekeepers /US/tech/tk652/tk701/technologies_tech_note09186a00800c5e0d.shtml 7. Upkar varshney, andy snow, et al,“ VOICE OVER IP”, Communications of the ACM, january 2002
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