Your support agent may request you provide additional details about your Cisco 7841 phone in order to complete your support request. If you are using a different phone, please go to the Cisco Phone User Guides to select your correct model. 
How to locate the Phone's MAC address on at Cisco 7841
- Option 1: Physical Label
- Look for the white label on the bottom right corner of the phone.
- Find and type the MAC address into your support ticket. In the example below, the MAC Address is 00B8B32C0412.
- Look for the white label on the bottom right corner of the phone.
- Option 2: Using the phone's on screen display
- Look for and press the gear
button on the phone to enter the settings menu. - Press the number "4" key
on the phone or use the scroll wheel 
to select the "Phone Information" from the list. 
- Under Phone Information, the MAC address should be listed. Record the MAC address and provide this information in the ticket. In the example below, the MAC address is 00:B8:B3:2c:04:12
- Press the button under the "Exit" key twice to exit the menus.
- Look for and press the gear