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:
Verify the log timestamp
0227184211|copy |4|03|Configuration of URL failed
Above shows an example time Stamp once the phone has successfully received an NTP time.
Before this, the phone can only display the time elapsed since booting the phone. This is especially important for any certificate verification and/or TLS.
The format usually is MMDDHHMMSS aka the above shows February the 27 and 18:42:11
No working NTP:
000052.432|sip |4|03|Registration failed User: 1041, Error Code:480 Temporarily not available
the above shows 52 seconds since the phone started.