Avaya Aura Communication Manager 7.1 User Manual

DDT; Reviewed:
SPOC 10/18/2017
Solution & Interoperability Test Lab Application Notes
©2017 Avaya Inc. All Rights Reserved.
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CM71SM71-VzIPCC
3.2. Call Flows
To understand how inbound Verizon toll-free calls are handled by Session Manager and
Communication Manager, key call flows are summarized in this section.
3.2.1 Inbound IP Toll Free Call with no Network Call Redirection
The first call scenario illustrated in Figure 3 is an inbound Verizon IP Toll Free call that is routed
to Communication Manager, which in turn routes the call to a vector, agent, or phone. No
redirection is performed in this simple scenario. A detailed verification of such a call with
Communication Manager traces can be found in Section 9.1.1.
1. A PSTN phone originates a call to a Verizon IP Toll Free number.
2. The PSTN routes the call to the Verizon IP Toll Free service network.
3. The Verizon IP Toll Free service routes the call to the Avaya Session Border Controller for
Enterprise.
4. The Avaya Session Border Controller for Enterprise performs any configured SIP header
modifications, and routes the call to Session Manager.
5. Session Manager applies any configured SIP header adaptations and digit conversions, and
based on configured Routing Policies, determines where the call should be routed. In this
case, Session Manager routes the call to Communication Manager using a unique port so
that Communication Manager can distinguish this call as having arrived from Verizon
IPCC.
6. Depending on the called number, Communication Manager routes the call to a) a hunt
group or vector, which in turn routes the call to an agent or phone, or b) directly to a phone.
Verizon
IP Toll Free Service
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3
2
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Avaya Aura®
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Figure 3: Inbound Verizon IP Toll Free Call – No Redirection
3.2.2 Inbound IP Toll Free Call with Post-Answer Network Call Redirection
The second call scenario illustrated in Figure 4 is an inbound Verizon IP Toll Free call that is
routed to a Communication Manager Vector Directory Number (VDN) to invoke call handling
logic in a vector. The vector answers the call and then redirects the call back to the Verizon IP Toll
Free service for routing to an alternate destination. Note that Verizon IP Toll Free service does not

Avaya Aura Communication Manager 7.1 Specifications

General

Brand	Avaya
Model	Aura Communication Manager 7.1
Category	Conference System
Language	English