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I'm trying to register a Telstra T-Voice 502 handset to a T-Gateway 797nv3. It initially replies that it is registered and then immediately says registration failed. It does appear that the phone is registered because I can make and receive calls but every 5 minutes or so I get a beep and an error message "Operation Failed" followed by another beep and the message "Please Provision a Line". I can only de-register the phone by registering an old T-Hub 2 handset. HELP
Can you try resetting the TG797 back to it's factory default settings and then try registering the handset again.
To do this get a paperclip, or something similar, and press and hold it into the reset hole at the back of the T-Gateway, keep in pressed in for 15 seconds. Give it 2-5 minutes to reconnect to the internet.