TEHO – Tail End Hop Off

Tail End Hop Off (TEHO) refers to routing long-distance calls across the VoIP network and dropping them off to the Public Switched Telephone Network (PSTN), as a local call, at a remote gateway. In TEHO situations, you can reduce the configuration complexity from the need to configure N2 entities to needing only N entities. The following assumptions for TEHO apply:

• Each site has a different route pattern and route list for each of the other N-1 sites.
• For a given site, S, each of the N-1 route lists to another (remote) site has, as first preference, a route group of one or more gateways that are local to that other site followed by, as second preference, a route group that is local to S. Therefore, when sufficient trunking resources are available to honor the first preference, a long-distance call uses a gateway at the remote site to go offnet and thus bypass any tolls; otherwise, the call defaults to a local gateway and incurs toll charges.

Again, Cisco Unified Communications Manager has an identical routing policy for all sites. The second preference of routing a call through the local PSTN of a site (if the system fails to drop off the call as a local call at the remote PSTN) forces the customer to provision separate instances of all routing information for each site.

Cisco Unified Communications Manager Features and Services Guide, Release 7.0(1)

Implementing TEHO with PSTN Backup in Cisco Unified Communications Manager Learning Module:

Watch "Implementing TEHO with PSTN Backup in CUCM" module to cover basics for TEHO. By the end of this module, you will be able to:

• Describe the purpose and basic operation of TEHO
• Identify considerations when implementing TEHO
• Describe how TEHO is implemented
• Configure TEHO between two sites with PSTN Backup

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