I just experienced an issue where an Analog phone connected to a VG224 (configured to use SCCP) was having its time reset on its display. The time on the analog phone was being set manually through the phone interface and then when the phone would make an outbound call or receive an inbound call the time on it would reset. In doing a "show clock" on the VG224 it was connected to I discovered that the phone's time matched the VG224's time. I thought there was no way the time would be passed to the phone from the VG but it appears that it was. To resolve the issue I set NTP and the timezone on the VG224 appropriately and it fixed the issue. Does anyone know how or why the analog phone would be getting time information from the VG? Has anyone else out there experienced this issue?
Re: VG224 And Time Issues On Attached Analog Devices
Thank you both for your replies. I did not try disabling the caller ID as part of the troubleshooting and the phones mostly being used were some model of VTECH phones. It looks like that link that Paolo included contains information about the phone getting time from the router so thank you for the link Paolo. I believe that clears it up.
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...