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RADIUS Server Radius Server Originating GW Terminating GW PSTN Ingress Call Leg 1 VoIP PSTN Egress Call Leg 2 Ingress Call Leg 3 4 Egress Call Leg • Generally speaking, bill from call legs 2 or 3 • Connect state is determined off of call leg 2 or 3 • Call leg 1 will have excess time (user authentication, IVR, radius authorization) VVT-221 2915_05_2001_c1 © 2001, Cisco Systems, Inc. All rights reserved. Copyright © 2001, Cisco Systems, Inc. All rights reserved. Printed in USA. 842 PST Fri Dec 31 1999 89 © 2001, Cisco Systems, Inc.

Open Settlements Protocol OSP Clearinghouse OSP Server DGK DGK V V Mediation VV ITSP #2 Radius V Radius ITSP #3 V Radius DGK • Open Settlements Protocol (OSP) - server used in clearinghouse for interdomain call routing, billing, and security • Call Routing - Routes configured centrally on OSP Server • Billing - Billing settled centrally on OSP Server • Security - Token based Each GW in wholesale network need to have OSP client. Transit GW needed to integrate existing DGK based network VVT-221 2915_05_2001_c1 © 2001, Cisco Systems, Inc.

Scr PSTN 64 Call Admission Control to Assign Priority to GW 415666 Pri 10 415 Priority 5 • Gatekeeper can select best available GW the first time to increase call completion rates and lower post-dial delay GK 415666 Pri 10 415 Priority 5 • GW priority selected on GK to prioritize GW selection PSTN VVT-221 2915_05_2001_c1 © 2001, Cisco Systems, Inc. All rights reserved. 1 GK(config-gk)# zone prefix west-gk 415666.... gw-pri 10 gw1 GK(config-gk)# zone prefix west-gk 415777.... gw-pri 10 gw2 default priority is 5 resultant Master list master list: gw1, gw2 408666 list: pri 10 gw1; pri 5 gw2 408777 list: pri 10 gw2; pri 5 gw1 © 2001, Cisco Systems, Inc.

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Deploying Large-Scale H 323 VoIP SP Networks


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