V-Tap VoIP Manual EN v2.7 Oct 2018 © 2017-2018 Vidicode 21
3.3.5
NTP settings
NTP (Network Time Protocol) can be used to synchronize the internal
clock. The V-Tap VoIP also has an internal battery to keep the clock
running when power fails, but this is not as accurate as the clock on an
NTP server. NTP gets the exact date and time from the server and the
internal clock is then updated with this.
The clock is added to each packet in the Tunnel protocol and is
therefore very important to get the date and time right for all recorded
calls. Specially, when Tunnel data is first stored on an SD card and later
interpreted by the Call Recorder VoIP software on the PC.
The V-Tap synchronizes the clock 6 times per day (each 4 hours).
NTP Server Address
The IP address or the host name of the NTP server. Default, the
address
is set to “
pool.ntp
.org”, but
the Gateway and the DNS server
must be defined also for this to work.
Leave this field empty when no NTP is used.
GMT Minutes Correction
The time correction in minutes to the GMT (Greenwich Mean Time)
zone. The number can start with the minus sign when needed.
For example, enter “
-
300” for Eastern Time (that is
-5 hours for east-
coast US & Canada).
NTP Port Number
The used port number for NTP in the TCP protocol. This is always 123.
