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Chapter 4 - Call Establishment Principles What Are Call...

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Call Establishment Principles What Are Call Legs? This topic describes call legs and their relationship to other components. 3 © 2005 Cisco Systems, Inc. All rights reserved. Cisco Public IP Telephony Dial-Peer Call Legs Call legs are logical connections between any two telephony devices, such as gateways, routers, Cisco CallManagers, or telephony endpoint devices. Call legs are router-centric. When an inbound call arrives, it is processed separately until the destination is determined. Then a second outbound call leg is established, and the inbound call leg is switched to the outbound voice port. Example: Call Legs Defined The connections are made when you configure dial peers on each interface. An end-to-end call consists of four call legs: two from the source router perspective (as shown in the figure), and two from the destination router perspective. To complete an end-to-end call from either side and send voice packets back and forth, you must configure all four dial peers. Dial peers are used only to set up calls. When the call is established, dial peers are no longer used. 4-4 Cisco Networking Academy Program: IP Telephony v1.0 Copyright © 2005, Cisco Systems, Inc.
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