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Session Manager supports the Assured Services SIP feature by using a combination of different features. Administrators can enable or disable the Assured Services SIP feature using a Session Manager global setting and configuring the supported network domain. By default, the feature is disabled.
Session Manager allocates bandwidth to calls based on the priority of the calls. Session Manager determines the priority of the call from the Resource-Priority header in the Invite request. If Session Manager does not have adequate bandwidth to allocate to a high-priority call from the specific domain that is configured for precedence, Session Manager preempts one or more lower-priority calls. Preempting lower-priority calls frees up the associated bandwidth, allowing Session Manager to ensure that adequate bandwidth is available to successfully establish high-priority calls.
Assured Services Admission Control assigns bandwidth limits for audio and video to network entities and links. Assured Services Admission Control also monitors the bandwidth usage and ensures that the bandwidth used by network entities and links does not exceed the specified limits.
The Assured Services SIP IP gateway supports the insertion of necessary routes between Enterprise Session Controllers and Local Session Controllers which are connected with soft switches and SBCs. Session Controllers insert a primary route, which passes through a designated set of SBCs, when processing calls to the primary soft switch. The insertion of the primary route ensures that the routes of all calls are established through the set of SBCs. If the primary route components or the network fails, Session Controllers detect the failure using the SIP OPTIONS method. Session Controllers establish all subsequent calls using the alternate route to the secondary soft switch that passes through a secondary set of SBCs.