You can tap on Record to start recording a new iPhone voicemail greeting and then Stop when you are done. Tap on Play to listen to it so you don’t have an embarrassing mistake or noise in it. When you are satisfied with the message, tap Save in the upper right.
YAY! Finally! This worked! Thanks SO much, as I’ve been dealing with this for over a year.

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.
Once you’ve done that, head to the settings menu (the gear icon) on the Google Voice homepage and select Settings. Then, click the Calls tab. In the section “Call Options,” check off “Enable recording (4), Switch (*) and Conference options on inbound calls.” With this setting selected, whenever you make a Google Voice call on your phone, you can tap the number 4 on its dial pad to start recording.