Solved a problem with my cordless phone time display. After setting up time on the phone, it was fine for some time but it would go completely wrong somehow. I had thought it was due to a defect in the phone.
It turned out to be my time setting on VoIP ATA. I did not care to set up the proper day and time in ATA when I configured it. Phones sold in North America gets its time from the line. With the second incoming ring, time data is sent, phone uses this data to update its time. When using VoIP ATA, the time data is sent by ATA, so my mis-configured ATA's wrong time setting overwrote phone's time setting every time it rang.
The feature that phone getting time from VoIP ATA is actually a cool one because I can then use a public NTP server to get the most accurate time to ATA. And my phone will always has accurate time.
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