[Asterisk-Users] Cisco 7940 - Disappearing Clock

[Sophus]

The clock on cisco phones 'disappears' when it fails to receive
updates from the ntp server.

This is most likely due to your ntp server configuration.  By default
the ntp mode on your cisco phone is directedbroadcast.  If your ntp
server doesn't support this you will need to change the mode on your
phone to unicast.

This is well documented by Cisco -

Cisco SIP IP Phone Administrator Guide
http://www.cisco.com/en/US/products/sw/voicesw/ps2156/products_administration_guide_book09186a00801d1978.html

Please read!


Cheers
Sophus