Installation guide

126 Planning and Installation Guide ShoreTel 14.2
Network Call Routing Specifying Parameters for the Routing Decision
7
Defining Trunk Services
1. Open the Trunk Services dialog box on the Trunk Group edit page.
2. Select the services that will be available for the selected trunk.
3. Refer to the ShoreTel System Administration Guide for more information about the Trunk Group
edit page.
Defining Admission Control
1. Open the Site edit page.
2. Enter the proper amount in Admission Control Bandwidth.
3. Refer to the ShoreTel System Administration Guide for more information about the Site edit page
and for instructions about computing Admission Control Bandwidth.
Specifying Parameters for the Routing Decision
Once the available set of trunks is established, the switching software makes a routing decision, with
the goal of minimizing toll charges and WAN bandwidth. The Network Call Routing algorithm bases the
routing decision on the Local Area Code, Additional Local Area Codes, and Nearby Area Codes
defined on the Trunk Group edit page.
Network Call Routing Algorithm
When multiple trunks meet the same criteria, a trunk is seized randomly. In general, trunks that are
configured last are hunted first. Over time, however, as trunks are deleted and added, hunting
becomes increasingly random.
SIP trunks are given precedence over Digital trunks, which are given precedence over analog trunks in
all routing decisions. When asking the Routing decision, the algorithm poses the following questions:
1. A trunk at the originating site for which the call is local?
2. A trunk at the proxy site for which the call is local?
3. A trunk at any other site for which the call is local?
4. A trunk at the originating site for which the call is considered nearby?
5. A trunk at the proxy site for which the call is considered nearby?
6. A trunk at any other site for which the call is considered nearby?
7. A trunk at the originating site designated for long distance?
8. A trunk at any proxy site designated for long distance?
9. A trunk at any other site designated for long distance?
10. Any remaining trunk available at originating site?