Step 1: Connect the SNOM to the network and let it get an IP Address.
Step 2: Log in to the device’s web interface.
Step 3: Click on the Identity 1 option on the left under the Setup category.
Step 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
Step 6: Select System Information to confirm Identity 1 is online.
Step 7: Navigate to the Advanced section on the left.
Step 8: Choose Behavior.
Step 9: Disable Challenge-Response.