How to Set Up a Cisco SPA303

The Cisco SPA303 is an IP phone that works with VoIP and can be used with Telzio. This guide will walk you through setting up the Cisco phone with your Telzio SIP user.

How to Set Up a Cisco SPA303

How to set up a Cisco SPA303 IP phone in 6 easy steps:

Step 1

Log on to your phone’s web interface by typing the phone’s IP address in your browser.

You can find the IP address by pressing the “settings” button (the one looking like a sheet of paper right under the voicemail/letter button), and pressing 9. 

Step 2

Click on the “Admin Login” link in the upper right corner of the page, followed by a click on the “Phone” tab.

Under “Line Key 1”, “Line Key 2” and “Line Key 3”, change the “Extension” value to “1”.

Step 3

Click on the “Ext 1” tab and enter following settings:

– Line 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 you created on Telzio
– Password: The password for the user.
– Use auth ID: No
– Preferred Codec: G711u
– Use preferred codec only: Yes

Step 4

Click on the “Advanced” link in the upper right corner of the page, followed by a click on the “EXT1” tab.
Set “SIP Transport” to “UDP”.

Step 5

Click on SIP in the menu, and under “RTP Parameters”, set RTP Packet Size to 0.020

Step 6

Click on “Submit all changes”. Your phone will now restart, and you are ready to call.

Thomas is part of the marketing team at Telzio and develops thought leadership content in the areas of cloud computing and unified communications. With an education in electrical engineering and background in software development, Thomas has a strong technical understanding pertaining to cloud networking technologies, trends, and practices.