COR Operation

Two definitions are critical to understanding COR operation. In mathematics, a set is a list of numbers or labels. A subset is a set whose members are wholly contained in another set. Applying these concepts makes understanding COR operation simple. Calls succeed as long as the outgoing COR list is a subset of the incoming COR list. Table 12-1 shows the relationship between incoming and outgoing COR lists.

Table 12-1. COR Operation

Incoming COR List

Outgoing COR List




Call succeeds



Call succeeds



Call succeeds


Subset of incoming COR list

Call succeeds


Not a subset of incoming COR list

Call fails


If either the incoming dial peer or the outgoing dial peer does not have a COR list applied, the call succeeds.

Part I: Voice Gateways and Gatekeepers

Gateways and Gatekeepers

Part II: Gateways

Media Gateway Control Protocol


Session Initiation Protocol

Circuit Options

Connecting to the PSTN

Connecting to PBXs

Connecting to an IP WAN

Dial Plans

Digit Manipulation

Influencing Path Selection

Configuring Class of Restrictions

SRST and MGCP Gateway Fallback

DSP Resources

Using Tcl Scripts and VoiceXML

Part III: Gatekeepers

Deploying Gatekeepers

Gatekeeper Configuration

Part IV: IP-to-IP Gateways

Cisco Multiservice IP-to-IP Gateway

Appendix A. Answers to Chapter-Ending Review Questions


Cisco Voice Gateways and Gatekeepers
Cisco Voice Gateways and Gatekeepers
ISBN: 158705258X
EAN: 2147483647
Year: 2004
Pages: 218 © 2008-2020.
If you may any questions please contact us: