Call is hanging up exactly 21 seconds into every call

My Softphone is hanging up exactly 21 seconds into every call, incoming or outgoing. I can't figure out how to fix it.

• It's possible your internet isn't connecting to the RTP ports (UDP 10000-65000).
• Our your MicroSip is not configured correctly.

Solution

• Go to MicroSip's Settings and edit the fields Source Port and RTP Ports.

• If you already have the previous configuration and it still doesn't work, try this one.

• If you MicroSip Status is connecting, try this one.

If your problem persist

If you are unable to get the configuration working, please contact us at itis.cmsupport@softtek.com. To help us resolve this quickly, please include:

-Your Public IPv4: (Found at https://checkip.amazonaws.com/)

-Screenshot of Settings: Ctrl+P

-Screenshot of Account: Ctrl+M

-Issue Description: A brief summary of the problem you are facing.