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In step 3, Avaya Aura® Communication Manager (CM) sends SIP Options to 1011112 looking for a 200 ok response to check it is reachable. 

In step 2, Avaya Aura® Session Manager (SM) matches 1011111 with a Communication Profile, and uses the defined Originating Application Sequence to route the call to Avaya Aura ® Communication Manager.

In step 1, when 1011111 draws dial tone it sends an Invite to Avaya Aura® Session Manager (SM) with the Request URI containing 1011111.

In step 2, the Avaya Aura® Session Manager (SM) uses a dial pattern and routing policy to route the call to Avaya Aura® Communication Manager (CM). 

In step 4, Avaya Aura® Communication Manager (CM) sets up the media path between the two endpoints.

To allow one Network Region to temporarily use bandwidth allocated to another Network Region if it runs out of bandwidth

To provide temporary overflow bandwidth when the direct allocation of bandwidth between connected Network Regions is not available