SBC Call Routing Reference Best Practices

In this section:

Overview

This document provides a brief description of each element within a Call Route; for full details on field definitions, refer to Creating and Modifying Entries to Call Routing Tables.

These instructions assume knowledge of navigation and configuration in the WebUI.

Call Routing Configuration

Field	Basic Description
Description	Call Route's name
Admin State	Enable/Disable Route
Route Priority	Adjusts order of call route processing. Routes are sorted first by priority, and then top-to-bottom order. 1 = highest priority
Call Priority	Used with E911. Sets the Priority header.
Number/Name Transformation Table	Transformation Table name.

Field	Basic Description
Destination Type	Any Normal Description A Destination SG that has a Register Table If Transformation Table evaluates TRUE, Deny (reject) the call.
Message Translation Table	Permits changes like turning 183 Progress into 180 Ringing, changing ISDN IEs, or discarding selected messages.
Cause Code Reroutes	If the call is rejected with a Cause Code present in this list, then proceed to the next call route; otherwise disconnect incoming call leg.
Cancel Others Upon Forking	Imagine a forked call to Skype and mobile; and Skype is forwarded to the mobile. Unless this is enabled, mobile will receive two calls, forked and forwarded.
Fork Call	Simultaneously processes this route and next route in the table. Places calls to both routes.
Destination Signaling Groups	If the Transformation Table succeeds, sends the call out the listed Signaling Group.

Field	Basic Description
Audio/Fax Stream Mode	Determines how the SBC handles call signaling and Audio/Fax media stream during a call.
Video Application Stream Mode	Determines how the SBC handles call signaling and Video/Application media stream during a call.
Media Transcoding	Controls transcoding, such as incoming SIP G.711 to outgoing SIP G.723 (Not required for ISDN to SIP calls).
Media List	Provides the ability to select codecs based upon the individual route. Creates a list of codecs common between the incoming SG and the route codec list. Creates a different list of codecs commen between the call route and the egress SG. Transcodes between the ingress and egress, if the final codecs for the call legs are different.

Field	Basic Description
Quality Metrics Number of Calls	Sets the number of calls to average the RTCP statistics over.
Quality Metrics Time before Retry	If the route is disabled for quality issues, this amount of time is required before the route is used again.
Min. ASR Threshold	Answer to Seizure (attempts) Radio. If the percentage of completed calls falls below this number, disable the route for Time Before Retry time. 0 = disabled.
Enable Min MOS Threshold	Enables MOS score.
Enable Max. R/T Delay	If Enabled and the RTT delay exceeds the configured value, disable the route for the Time Before Retry time. Calculated from RTCP information.
Max R/T Delay	Specifies Round Trip delay.
Enable Max. Jitter	If Enabled and the Jitter delay exceeds the configured value, disable the route for the Time Before Retry time. Calculated from RTCP information.
Max. Jitter	Maximum average jitter.