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28 Services and

28 Services and featuresMedia Server provides media services through IPv6, while the S3 providesthe communication between single stack IPv4 clients and single stack IPv6clients through its IPv6/IPv4 interworking capability.Subscriber Location and RoutingThis section describes the Subscriber location and routing feature.Feature descriptionIn the current deployment model, domain names cannot be shared acrossdistinct sites. Routing between sites must be done using translations orforeign domain routing. This puts limitation on customer deployments, andon the number of subscribers allowed in a domain.When a customer’s system grows across multiple C20s or multiple ASs, itbecomes too cumbersome to map specific URLs to DNs for registration.Customers need to provide their clients with a single interface to registerand login without having to change the IP URL address of the SIP client.In the current deployment model, when a new domain is defined, a locationserver is assigned as the home server. All users and resources added tothe domain are homed on the same application server. Thus, users areassigned to domains and domains are homed on Session Managers.Though the primary purpose of a domain is for addressing, domains arealso used for capacity management for a Session Manager, administrationmanagement functions, grouping capabilities for Translations, resourceassignments for the domain, and for default service preferences for allusers in the domain.The Subscriber Location and Routing feature allows a single domain to beshared between AS sites. Such a domain is called a multisite. The featureallows locating and routing messages to a subscriber on a multisite domainin a separate site. This function is performed through a query to an LDAPserver. All provisioning details of sites in a multisite are stored both in theDatabase and LDAP.This feature also allows Subscriber Mobility within the AS sites in a multisitedomain. Mobility is supported only for SIP-based devices. UNISTIMdevices do not support mobility. Users can gain access to their accountsfrom a client homed in another site. This feature does not require that auser change the proxy information, but rather the user enters the username and authentication information, and the system determines thelocation for that subscriber.15 August 2014 EXPERiUS Application Server NN48111-111 09.02Copyright © 2010-2014 GENBAND. All Rights Reserved.

General features 29In addition, subscribers (either in single site or multisite domain) areassociated directly with a home Session Manager as opposed to theirdomain being associated with the Server home. This eliminates theoverloaded functions of the domain such as capacity management forSession Managers.Server Home/Domain decouplingThis feature removes the domain to server home association and allowsassigning server home to each user and resource independently from thedomain. Users still have domains but they are homed directly on serverhomes (Session Managers). This feature allows for better scalabilitymanagement.Subscriber lookupIt is not possible to store locally all the subscribers for a multisite domain.Yet the knowledge of their routing information is needed.An LDAP Server is used to store and query the routing information forsubscribers in a multisite domain when they are not homed on the localSystem. The subscriber is looked up initially in the local system and whennot found, a query is initiated to a third party LDAP Server.Subscriber MobilityIn a multisite domain environment, some users are allowed to register toany site sharing the domain. In this case, the registration is redirected tothe home server for the subscriber.Migration strategyFor cases where an existing single site domain needs to be set to multisite,the bulk operation resulting from the change needs to be monitored forduplicate and the provisioning client cannot be used. This featureintroduces the Single to Multi-site Migration Tool (SMMT) for this purpose.Support for configuration of SIP terminalsThe Provisioning Data Server (PDS) is a third-party software used tomaintain the end-user and device configuration SIP profiles. As the PDSdoes not have direct access to IP clients, it proxies notification aboutchanges in configuration information, that it maintains, to IP clients throughAS SESM. The Support for configuration of SIP terminals feature providesa mechanism on the AS to proxy SIP Notify messages received from theProvisioning Data Server to IP clients.The Provisioning Data Server (PDS) triggers a SIP Notify message toinform the clients when there is a change in configuration information.When the Notify message is received, the AS proxies them to the IPClients, based on registration details. The Notify message is sent to theregistered client if the client supports Check-Sync events. The Notify15 August 2014 Product Description NN48111-111 09.02Copyright © 2010-2014 GENBAND. All Rights Reserved.

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