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Cisco SPA303 SIP Instructions


1. On your phone, go to "14: Factory Reset" and click OK.

2. Log into the phone’s web configuration, then under "Basic Settings -> Ext 1"

Set the following settings:
  • Line Enable: yes
  • NAT Mapping Enable: yes
  • Proxy:
  • Register: yes
  • Register Expires: 300
  • Display Name: Talkdesk
  • Password: <password>
  • Auth ID: <username> (shouldn’t include in the username)
  • User ID: <username> (shouldn’t include in the username)
  • Use Auth ID: Yes
  • Preferred Codec: G711u
Then click “Submit all Changes” at the bottom of the screen.

3. Under "Advanced Settings -> Ext 1” make sure the following settings are set to:
  • Proxy:
  • Outbound Proxy:
  • SIP Transport: TCP
And then click “Submit all Changes” at the bottom of the screen.

Your phone should now be configured to be able to receive and make calls.
Optionally change the display name that appears on the phone by going to Phone Tab > Line Key > Short Name and replacing “$USER” with any text you like.
4. Under “Advanced Settings -> SIP” make sure the following settings have been set to:
  • Under RTP Parameters set RTP Packet Size to 0.020

Note: Some limitations apply when using SIP phones with Talkdesk.


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  • Avatar

    This worked in configuring my Cisco IP Phone SPA504G - great article!

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