Why does the ATA 186 parameter changes made through the Web Server Interface or interactive voice response (IVR) revert back to their previous settings after a period of time?

A. The ATA 186 has a cached value of its profile stored in the flash ROM. This is what you see or hear via Web Server Interface or IVR.

If the USETFTP parameter is set to 1, then the cached value of the ATA 186 profile is synchronized with the profile located on the TFTP server. This synchronization update of the cache value occurs approximately at the interval determined by the CFGINTERVAL parameter value or at power up reset. If you use TFTP for provisioning, you should not use the Web Server Interface or IVR to modify the value of your ATA profile.

The Web Server Interface or IVR should only be used when first configuring the ATA to use TFTP provisioning. If you do not use a TFTP to provision your ATA, and you use the Web server interface or IVR configure the ATA profile, then the USETFTP parameter should be set to 0. More.

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