How to Configure a Cisco 7921 Phone With Call Manager Express

Written by george garza
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How to Configure a Cisco 7921 Phone With Call Manager Express
Call Manager Express allows routers to use VoIP on 7921 phones. (wireless home network image by jaddingt from

The Cisco Call Manager Express (CME) software has a new name, Cisco Unified Communications Manager Express. However, it provides the same service, namely IP Telephony that runs on Cisco Integrated Services routers. The Cisco 7921 phone is one of a series of VoIP phones in the catalogue. It uses the wireless standards 802.11a, b, and g and it has 2.4 and 5 Ghz capabilities. Its other features are a built-in speaker phone and a two-inch display. A diversity antenna is available for better radio frequency coverage.

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  • Call Manager Express

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  1. 1

    Type "enable" to enter the router privilege mode. In this mode, you can configure the router and set up the 7921 phone commands. The privilege mode looks like this: "Router#." (Exclude the period.) Privilege mode contains an editor that opens automatically. You type all commands within the editor, but there are different modes depending on the type of command you are typing. You get to those modes automatically by typing the command to initiate the mode. (Note: in these commands, case is not important.)

  2. 2

    Type " ip dhcp pool VOIP" followed by "network" followed by "option 160 ip lease 8." This command sets up a DHCP (Dynamic Host Configuration Protocol) pool, a leased range of addresses given to network devices. The network term identifies the routing network on the router. The option number identifies the location of the tftp server on the Vlan (Virtual Local Area Network)and where the CME is.

  3. 3

    Type "Interface Fastethernet0/0" followed by "description Internal Vlan" then followed by "ip address" (Exclude the last period.) Here, you have configured an Ethernet port on the router.

  4. 4

    Type "interface fastethernet0/0.2" followed by "description VoIP Vlan" with the next command as "encapsulation dot1q 2" and ending with " ip address" (Exclude the last period.) Now you have identified the tftp server, which houses the CME. The next step will set up the 7921 phone.

  5. 5

    Type "ephone-dn 1" followed by "number 99." Then type "label EntOffice" and ending with "name EntOffice." (Exclude the last period.) The reason you type in "number 99" (not just 99) is that the office phone extension is 99.

  6. 6

    Type "ephone 1" followed by "description home office" and then "mac-address 0018.95AF.2b73." (Exclude the last period.) The last two commands are "type 7921" and "button 1:1 2:2." (Exclude the last period.) The "mac address" is the phone's serial number address. The type is the 7921 phone system, and the button command maps the phone buttons to the ephone-dn. This allows automatic configuration of the dial peer (the end point of a phone call - where you are calling) and virtual voice ports with the buttons on the phone.

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