Justin Purser wrote: > Hi, > > I would like to use a NTP server for an IP phone. Is it possible to use > an IP address or similiar in the IP phone configuration? >
We setup an IP phone system at work recently. On the grandstream gxp-2000 (older, but also really inexpensive) the web interface has a spot for an ntp server with an option to allow DHCP option 42 to override it. We also got a few cisco ip phones because the grandstream's speakerphones aren't all that good. Those don't really have a web interface to them. There's a small config file you put on a tftp server that it gets info from. The NTP server isn't in there, but it still grabs the correct time. More than likely it sees the option 42 which I have set in the dhcp server to the ntp server to use. I would try setting an ntp server option in the dhcp server to see if that does it. I use dnsmasq for a simple dhcp server. If you scroll down in the default config file it will specifically say something like (if my memory serves me correctly) #dhcp-option=42,0.0.0.0 #NTP Server Uncomment the line, set the ip or dns name you want to use for ntp service (0.0.0.0 will use the ip of the computer running dnsmasq) and restart dnsmasq and see if that does it. If you use something else just look for a way to set dhcp option 42. If that doesn't work I would just try looking through the user manual if it's mentioned in there somewhere since each phone is different. I really just mentioned all the stuff above because it may be helpful to people that aren't aware of the option to set an ntp server. Although I don't know of any OSs that actually read that option by default, it's used for embedded applications, like phones.
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