YL SIP T-20 - Account wont Register

[Barnabas]

I'm having same registration problem from time to time. On the telephone web status screen I see "Registering" and nothing happens.

I often reset to factory defaults by holding the [OK] button and reconfigure. Sometimes that doesn't work either. My next option is to disable that slot(line) and program another slot(line) if available.

I experienced this problem with T28P and T22P phones as well. I reset the configuration, updated to the latest firmware but had no luck. I'll appreciate if someone could provide a permanent fix.

Regards,
Barnabas