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CONVERGENCE TECHNOLOGY CENTER Collin County Community College. Chapter 2 Router, Switch, and IP Phone Configuration. VoIP Basic Configuration.

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  • Collin County Community College

Chapter 2 router switch and ip phone configuration

Chapter 2Router, Switch, and IP Phone Configuration

VoIP Basic Configuration

Voice over IP (VoIP) or IP Telephony is used by many large and small business today. VoIP phones use the same network infrastructure as the computer. VoIP can be implemented on routers or severs using special Routers use CallManager Express (CME) and Servers use Cisco CallManager. Cisco now markets the products as Cisco Unified Communications.

CME or Unified Communications Manager Express works well in a small to medium sized company when 240 or fewer phones are needed. CallManager server is used in larger environments when more than 240 phones are required.

Implementing Basic VoIP

At the basic level Cisco IP Telephony requires:

VoIP Phones

CallManager (Unified Communications) software

Switch (VoIP compatible) Many modern Cisco routers can accommodate CallManager Express. The IOS software can be downloaded from Cisco website using a registered CCO account and Smartnet contract. Each router requires a specific CME IOS version.

VLAN Basics

  • A VLAN is a unique broadcast domain. By default all ports on a Cisco switch are set to VLAN 1. VoIP phones join a voice VLAN when registering with the network. Computers use a separate data VLAN.Terms associated with VLANs in this chapter include:

  • Default VLAN- all ports on an unconfigured (new) switch are assigned to VLAN 1 or default VLAN

  • Management VLAN- VLAN used to control a switch remotely

  • Tagging a frame- process of embedding VLAN information into a frame as it passes from one VLAN to another

    • Native VLAN- VLAN assigned when untagged frames enter a VLAN

Connecting a IP Phone to Network

One of the benefits of VoIP networks is that an additional cable to the wiring closet isn’t required. Instead of installing an additional cable, the computer can be connected through the phone, and the phone connected to the switch. Switches can also provide power to the phone over the network cable using Power over Ethernet (PoE).


IP Phone

RJ-45 Jack



Connecting a IP Phone to Network

Computer and IP phones are configured to be on different VLANs. Even though the computer and IP phone share one wire they are virtually on two different broadcast networks (VLANs).


IP Phone

RJ-45 Jack





VLAN 5 and 12 are carried in a trunk between switch and phone

VLAN 5 and 12 are carried in a trunk between phone and switch

Connecting a IP Phone to Network

Steps to Reset the 7940 and 7960 IP Phones to the Factory Default

In order to ensure the IP phones are clean from previous labs or installations it may be necessary to reset the phone to factory settings. The following steps will reset the phone.

Power the IP phone to by connecting to a PoE switch or power adapter.

Choose the main Date/Time window.

Press **# in order to unlock the Network Configuration on the phone.

Press Settings.

The Network Configuration lock symbol must be unlocked. If not, exit to the main window and press ** # again.

Press 3 on the keypad (or scroll down) for Network Configuration.

Press 33 on the keypad (or scroll down) to Erase Configuration.

Press the Yes softkey.

Press the Save softkey.

The phone must now be reset.

Connecting a IP Phone to Network

In order to perform a factory reset of a phone if the password is set, complete these steps:

Unplug the power cable from the phone, and then plug in the cable again.

The phone begins its power up cycle.

Immediately press and hold # and while the Headset, Mute, and Speaker buttons begin to flash in sequence, release #.

The Headset, Mute, and Speaker buttons flash in sequence in order to indicate that the phone waits for you to enter the key sequence for the reset.

Press 123456789*0# within 60 seconds after the Headset, Mute, and Speaker buttons begin to flash.

Continued next slide

Connecting a IP Phone to Network

In order to perform a factory reset of a phone if the password is set, complete these steps:

If you enter this key sequence correctly, the phone displays this prompt: Keep network cfg? 1 = yes 2 = no

In order to maintain the current network configuration settings for the phone when the phone resets, press 1. In order to reset the network configuration settings when the phone resets, press 2.

If you press another key or do not respond to this prompt within 60 seconds, the phone continues with its normal startup process and does not reset. Otherwise, the phone goes through the factory reset process.

Connecting a IP Phone to Network

IP Phone Resources

Cisco IP Phone Tutorial

Interactive 3D model of Cisco IP Phone

Chapter 2 Labs

Chapter Two Labs

2-1 Connecting an IP Phone to a Switch

2-2 Resetting the configuration on a IP Phone

2-3 IP Telephony IP Addressing

2-4 Configuring a router and integrated switch with CME

2-5 Configuring a router and external witch with CME

This material is based upon work supported by the National Science Foundation under

Grant No. 0402356. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation