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Starting to implement D717 Deskphones running Firmware 10.1.141.10 (recommended 3CX version)

We notice that the phones don't use the NTP source (ip address) offered in the DHCP options (both 4 and 42)
What we see on network behaviour is that still a connection is being made to an IP from pool.ntp.org is (after loading phone application).

This behaviour is not as expected and not what the configuration manual says.

When I look in the phone Web User Interface, it mentions pool.ntp.org (greyed out)
When the phone boots, it shows the in DHCP options set correct NTP source, before loading the phone application

I have to mention that we offer 2 Ip addresses as time source.
(now testing with only 1 IP address)

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Summa College Netwerkbeheer

End user

Joined: 07.02.2024

1 Comment

  1. End user Summa College Netwerkbeheer

    I figured out what was happening here.

    As it turns out, the 3CX server also has a custom parameter that is used to provision the ntp source.
    As the phone is provisioned from 3CX it will override the setting from the DHCP server.

    In v18 under Settings → Parameters
    Search for ntp

    Then you will find a parameter called TIME_NTP_SERVER
    This has a default value of: pool.ntp.org
    If you change this value to a NTP source of your liking (eg. an internal NTP source), this new value will be provisioned to the SNOM deskphone.