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222 OAMP strategies and

222 OAMP strategies and fundamentalsForeign domains locationForeign Domains do not have a visible association with the LocationInfrastructure, but they are integrated into the Location Infrastructureinternally through the automatic creation of the default other location foreach Foreign Domain.The foreign domain other location is limited in that it cannot be provisionedas an ERL. Consequently, emergency calls from foreign domains are notsupported by this feature.For non-emergency calls, a single unique location is all you need to enableforeign domains to benefit from the Location Infrastructure (such as MediaPortal insertion and selection).Foreign domains locationsUnderstanding Telephony Routing and TranslationsThis section provides a basic understanding of how to provision telephonystyle translations interworking with traditional circuit-switched networkrouting.• “Telephony routing concepts” (page 223)• “Telephony routing terminology” (page 227)• “Sample dial plan for telephony routes” (page 230)15 August 2014 EXPERiUS Application Server NN48111-111 09.02Copyright © 2010-2014 GENBAND. All Rights Reserved.

Provisioning fundamentals 223Telephony routing conceptsThe basic function of any communications equipment is routing, and SIPbasedsystems add requirements to routing when compared to traditionalcircuit-switched network-based routing. Routing in the VoIP networks addsthe complexity of integrating with the traditional circuit-switched networksand domain-based VoIP and SIP networks.SubdomainsSee “Subdomains” in “Domain types” (page 197) for subdomain concepts.Class of ServiceClass of Service (COS) screens restrict users from accessing certaintelephony routes within a domain and subdomain. The followingrestrictions are imposed on the use of COS:• COS values are assigned to routes as well as domains, subdomains,and subscribers. Access to routes is restricted by comparing the COSvalue assigned to the route with the COS value assigned to thesubscriber, or the default for the domain/subdomain if the call was notsubscriber-originated. Only routes with equal or lower COS values willbe selected.• A domain, subdomain, or subscriber has access to the routes if theassigned COS permits access to the routes.The domain-based COS value is used to determine the telephony routesfor incoming sessions from gateways or other SIP networks. In thesescenarios the Uniform Resource Identifier (URI) domain does not host theoriginator. Therefore, for security purposes, the URI domain's COS isapplied to screen the call.• If the From header and Request URI do not have the same domain,then the domain specified in the Request URI is used to determine thetelephony routes.• If the From and Request URI domains are the same and the originatoris an AS subscriber, then the originator's COS determines thetelephony routes. If the originator does not have an assigned COS,then the COS for the originator's subdomain is used. If the subdomainCOS is not found, go up the domain tree until you find a COS value seton a parent domain. If the COS value set is not found, then the call isrejected.• The same COS values can be assigned to a domain, subdomain, and asubscriber.15 August 2014 Product Description NN48111-111 09.02Copyright © 2010-2014 GENBAND. All Rights Reserved.

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