1. Connect the SNOM to the network and let it get an IP Address.
  2. Log in to the device’s web interface.
  3. Click on the  Identity 1 option on the left under the Setup category.
  4. The page will open on the “ Login” tab; fill in the SIP credentialsHow to Get Sip Credentials. 
    • This will allow the extension to register.
  5. Next, navigate to the RTP tab (Still under the Identity section) and make sure the settings are set like the image below :
    • Codec: g729
    • RTP encryption: Off
    • Media transport offer: UDP
  6. Select System Information to confirm Identity 1 is online.
  7. Navigate to the Advanced section on the left.
  8. Choose Behavior.
  9. Disable Challenge-Response.