Seamless Firewall

W-F cllng, ls clld VWF, rfrs t mbl phn vc clls nd dt tht r md vr P ntwrks sng W-F, nstd f th cll twrs prvdd by clllr ntwrks. sng ths ftr, cmptbl hndsts r bl t rt rglr clllr clls thrgh wrlss LN (W-F) ntwrk wth brdbnd ntrnt, whl smlssly chngng cnnctns btwn th tw whr ncssry. Ths ftr mks s f th Gnrc ccss Ntwrk (GN) prtcl, ls knwn s nlcnsd Mbl ccss (M). ssntlly, GN/M llws cll phn pckts t b frwrdd t ntwrk ccss pnt vr th ntrnt, rthr thn vr-th-r sng GSM/GPRS, MTS r smlr. sprt dvc knwn s "GN Cntrllr" (GNC) rcvs ths dt frm th ntrnt nd fds t nt th phn ntwrk s f t wr cmng frm n ntnn n twr. Clls cn b plcd frm r rcvd t th hndst s f t wr cnnctd vr-th-r drctly t th GNC's pnt f prsnc, mkng th cll nvsbl t th ntwrk s whl. Ths cn b sfl n lctns wth pr cll cvrg whr sm thr frm f ntrnt ccss s vlbl, spclly t th hm r ffc. Th systm ffrs smlss hndff, s th sr cn mv frm cll t W-F nd bck gn wth th sm nvsblty tht th cll ntwrk ffrs whn mvng frm twr t twr. Snc th GN systm wrks vr th ntrnt, M-cpbl hndst cn cnnct t ts srvc prvdr frm ny lctn wth ntrnt ccss. Ths s prtclrly sfl fr trvlrs, wh cn cnnct t thr prvdr's GNC nd mk clls nt thr hm srvc r frm nywhr n th wrld. Ths s sbjct t th qlty f th ntrnt cnnctn, hwvr, nd my nt wrk wll vr lmtd bndwdth r lng-ltncy cnnctn. T mprv qlty f srvc (QS) n th hm r ffc, sm prvdrs ls spply spclly prgrmmd wrlss ccss pnt tht prrtzs M pckts. nthr bnft f W-F cllng s tht mbl clls cn b md thrgh th ntrnt sng th sm ntv cllng clnt; t ds nt rqr thrd-prty Vc vr P (VP) clsd srvcs lk Whtspp r Skyp, rlyng nstd n th mbl clllr prtr.