Cisco 8800 Series

The Cisco 8800 Series is a series of business IP phones that you can use with your Telzio phone system. There are currently 8 different models in the 8800 series, offering up to 16 lines and simple web-based configuration.

In this article, you'll learn how to configure phones in the Cisco 8800 series to use with Telzio.

Important notes:

  • You must have a user before you can configure your phone.
    Learn more about Getting Started with Users.
  • If you’re using an IP phone that was used with another provider, do a factory reset on the phone before you get started.
  • This guide pertains to specific phones in the Cisco 8800 Conference series, including the .

Setup a Cisco 8800 Conference Series IP Phone

Log into the phone’s web interface

  1. Press the phone's "Settings" button, then "Status", then "Network Status". This will show the phone's IP address, which could look something like this:

Update the phone settings

  1. Click on the Admin Login link in the upper right corner of the page.
  2. Click on Phone.
  3. Under Line Key 1, Line Key 2, and Line Key 3, change the Extension value to 1.

Configure your User with the phone

Click on Ext 1 and enter the following settings:

  • NAT Mapping Enable: Yes
  • NAT Keep Alive Enable: Yes
  • SIP Port: 5060
  • Proxy:
  • Register: Yes
  • Register Expires: 3600
  • Make call without reg.: No
  • Ans call without reg.: No
  • Display Name: Your Name
  • User ID: The username for the User
  • Password: The password for the User
  • Use auth ID: No
  • Preferred Codec: G711u
  • Use preferred codec only: Yes

Set the SIP settings

  1. Click on the Advanced link in the upper right corner of the page
  2. Click on SIP
  3. Under RTP Parameters, set RTP Packet Size to 0.020


Click on Submit all changes.
Your phone will restart, and then you’re ready for calling.