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.

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Cisco Systems manual 138 165 IP Telephony v1.0 SBA Version