Vodafone enables you to choose the length of time a phone rings before going to voicemail. According to the Vodafone instructions: Enter **61*121*11* [Number of seconds]# Then enter the number of...
Step 4. Begin recording your custom voicemail message by tapping “Record.” You can also listen to your recording by tapping “stop” and “play” before proceeding to the next step.

I called customer support. They were not able to fix it and made it worse. Now it rings once instead of three times. They put in a service request and said it would be 1-3 days. Now they say 3 to 5 business days. I don't understand how something so simple could be such a major problem. I just wanted them to change the number of rings to at least 7. Disconnected the 1st of the junction boxes at top of door. Phone line rings after doing this so proves problem is in the home. I then ran a new wire pair to the NTE5, problem then came back, even with the pull out isolation port or whatever it’s called. Then wired direct to the back plate if that’s the correct term, phone starts ringing again.
You can record a new greeting in the Greetings & Pin area by tapping the default greeting and then recording a new one.