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ATA 186 parameter changes made through the web server interface or IVR revert back to their previous settings after a period of time

Core Issue

The Cisco Analog Telephone Adaptor (ATA) 186 has a cached value of its profile stored in the Flash ROM. This is what you either see or hear through the web server interface or Interactive Voice Response (IVR).

If the USETFTP parameter is set to 1, 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 happens approximately at the interval determined by the CFGINTERVAL parameter's value or at power up reset.

Resolution

If you are using TFTP for provisioning, you should not be using the web server interface or IVR to modify the value of your Cisco ATA's profile. The web server interface or IVR should only be used when first configuring the Cisco ATA to use TFTP provisioning. If you are not using a TFTP to provision your Cisco ATA and are using the web server interface or IVR to configure the Cisco ATA profile, the USETFTP parameter should be set to 0.

For more information, refer to these documents:

Frequency and Scope of Symptom

Occurs at regular intervals

Voice Gateways

Non-IOS gateways

ATA 186

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