In order to manage network quality of service (QoS) for SIP calls, deploy a Cisco Application Policy Infrastructure controller Enterprise module (APIC-EM). APIC-EM applies DSCP markings to media flows created by communication sessions among Cisco Unified Communications Manager-managed SIP endpoints and trunks. Applying DSCP markings to media flows ensures that audio and video media will not be blocked by other lower priority network traffic such as email, print jobs, and software downloads.

Configure call control discovery to advertise the Cisco Unified Communications Manager to other call control entities that use the Service Advertisement Framework (SAF) network. These call control entities can use the advertised information to dynamically configure their routing operations for the call.

Configure external call control to have an adjunct route server make call-routing decisions for your system. Unified Communications Manager issues a route request to an adjunct route server, which provides instructions about how to route the call, along with any additional call treatment to apply.

Configure call queueing to place callers in a queue until hunt members are available to answer them.

Configure call throttling to automatically throttle or deny new call attempts when system conditions can cause users to experience a delay in the interval between going off hook and receiving a dial tone. We recommend that you not modify call throttling parameters unless advised to do so by Cisco customer support.

Configure calling party normalization to reformat incoming phone numbers so that they display on the recipient's phone as globalized or localized phone numbers. Use this feature to improve callback functionality when a call is routed to multiple geographic locations, and to map a global calling party number to its localized variant so that a phone can return a call without modifying the directory number in the call log directories on the phone.

Configure logical partitioning to satisfy regulatory requirements in markets where toll bypass is forbidden. For example, you can configur ea policy prevent users from initiating restricted calls by using midcall features such as conference join and redirect.

Specify a geolocation for every device and communicate geolocation information across clusters. Geolocations assign a civic address to devices so that communication between devices can be controlled based on legal requirements in certain countries.

Location Awareness allows administrators to determine the physical location from which a phone connects to the company network.

Configure Multilevel Precedence and Preemption (MLPP) if you want to allow validated users to place priority calls. If necessary, these users can preempt lower priority phone calls.