Incorrect Time or Time and Date flashing
The Polycom phones utilize the DHCP Option 42 or Option 2 in order to receive a Time Server address (SNTP / NTP) and Option 2 as an GMT Offset.
More details can be found => here <=
Note: There is no option to set the Time or Date to a manual Value.
If the two options suggested below are unavailable then the Clock and Date functionality can be turned off via the Phones GUI:
Menu key => Settings => Basic => Preferences => Time and Date
Or via a configuration File using the provisioning method:
Option 1: No time Server or Offset provided via DHCP:
If no Time Server is provided when receiving the DHCP Offer then the phone will just flash the Time and Date in the Display.
NOTE: Above extract from a Wireshark Trace does show a DHCP Offer without a Time Server or Offset.
NOTE: Above extract from a Phone Log does show a DHCP Offer without a Time Server or Offset.
A Time Server can be specified using the Phones Web Interface as shown below using:
UC or SIP Software 3.3.5 or older
UC Software 4.0.0 or later
Or via a configuration File using the provisioning method.
<time device.set="1" device.sntp.serverName.set="1" device.sntp.serverName="pool.ntp.org" device.sntp.gmtOffset.set="1" device.sntp.gmtOffset="3600" />
Download the attached Manual_NTP.ip and Unzip and Import via the Web Interface Utilities > Import & Export Configuration > Import Configuration
Note: Please be aware that the gmtOffset parameter affects the timezone. 3600 would be GMT +1 !
My colleague Jeff Schertz shows => here <= how to change the offset via a DHCP server.
Option 2: Time Server and/or Offset provided via DHCP but are not desired:
If a DHCP Server offer is received and it is not desired to use the offered the Time Server or offset time then the following can be used:
NOTE: Above extract from a Wireshark Trace does show a DHCP Offer with a Time Server and Offset.
<time tcpIpApp.sntp.address.overrideDHCP="1" tcpIpApp.sntp.address="pool.ntp.org" tcpIpApp.sntp.gmtOffset.overrideDHCP="1" tcpIpApp.sntp.gmtOffset="0" />
Download the attached DHCP_override.zip and Unzip and Import via the Web Interface Utilities > Import & Export Configuration > Import Configuration
Note: Please be aware that the gmtOffset parameter affects the timezone. 0 would be GMT!
Option 3 verifying the NTP exchange:
Below shows a Polycom phone querying the NTP server and the NTP server replying with the current time
If troubleshooting via Wireshark is not a possibility the phone's log functionality can be used.
Either setting the relevant log level via a configuration file:
or changing this via the Web Interface:
The Phones log will then show the query of the NTP server: