Microsoft Office 365 Exchange UM with Legacy PBX
AudioCodes Mediant Gateway 22 Document #: LTRT-40512
4.2 Configure Network Time Protocol Server IP Address
The procedure below describes how to configure the Network Time Protocol (NTP) server
IP address. The gateway requires NTP for successful TLS negotiation with the Office 365
Exchange Online UM system
2
.
To configure the NTP server IP address:
1. Open the Application Settings page (Configuration tab > System menu >
Application Settings).
2. Configure the NTP (e.g. server IP address), as required.
Figure 4-2: Application Settings Page
3. Click Submit.
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In principle, all that is required is that the gateway and the Office 365 system have a sufficiently
similar view of the current time. It’s possible to set the date and time on the gateway itself, which
provides a clock that maintains the time. However, without the use of NTP, it is likely that the
gateway’s time will eventually offset sufficiently, relative to the Office 365 system, for TLS negotiation
to stop working. This may be difficult to diagnose and therefore it is recommended to use NTP to keep
the gateway’s time synchronized.
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