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IMS Application Developer's Handbook by Mats Stille, Anders Ryde, Ioannis Fikouras, Catherine Mulligan, Ulf Olsson, Rogier Noldus

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8.8. Application Servers in IMS

This section introduces the concept of application servers in an IMS network. The application server is connected through a number of reference points to the IMS core network. It is through service logic deployment in a SIP application server that an operator may control the multimedia sessions in the IMS network, and other IMS services.

8.8.1. Introduction and Concept

Application servers have a specific and prominent role in IMS. IMS differs from a CS network in this regard. In CS networks, calls may be established without the necessity for an application server (service control point, SCP) to gain control over the call. This is because the CS network itself is fully geared for offering a telephony service. In addition, ...

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