Question

A global enterprise uses globalized call routing with all internal directory numbers and route patterns normalized to +E.164. A user in the Chicago site dials a national number that resolves to +19725551234. The administrator wants the call to egress via the Dallas gateway to take advantage of Tail-End Hop-Off (TEHO), but if the Dallas WAN or gateway is unavailable, the call must fall back to egress out the local Chicago PSTN gateway. Which configuration approach correctly achieves this behavior?

Accepted Answer

Configure the TEHO route pattern to point to a route list whose first route group is the Dallas gateway and whose second route group is the Standard Local Route Group, applied through the Chicago device pool

Answer

Configure two separate +E.164 route patterns in different partitions and use Time-of-Day routing to switch between the Dallas and Chicago gateways

Answer

Assign the Chicago phones a Calling Search Space that contains only the Dallas gateway's partition so all calls always route through Dallas

Answer

Configure a single route pattern pointing directly to the Dallas gateway with the 'Provide Outside Dial Tone' option enabled to allow automatic failover