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138 - 165 IP Telephony v1.0 SBA Version 1: Copyright © 2005, Cisco Systems, Inc.
Case Study 2: Registering IP Phones with a local CME and forwarding calls to a
remote Call Manager
Objectives
• Place calls from IP Phones under R1 to IP Phones under R2
• Place calls from any IP Phone (under R1 and under R2) to the regular PSTN/POTS
Phone
• Place calls from the regular PSTN/POTS phone to IP Phones.
Scenario
The ACME Inc. has a new office in another city. In order to save money, a VoIP
environment will be implemented by you. One of the CME Routers will be located at the
company’s main office and the other at the company’s remote office. R1 is the Router with
PSTN/POTS connection and for this reason it must be configured to forward the
POTS/PSTN calls to R2’s IP Phones.