Anyone used this request to get the configuration to work?
What are you expecting it to return? Do you have any vendorConfig information stored with updateEnterprisePhoneConfig?
I was just unclear what do expect. You can set the Enterprise Phone Configuration from the web gui. I thought this request might returns all the values of product specific configuration values.
It only returns specific vendor configuration information. If there's no vendor-specific configuration for the device, you won't get any return values. This is for phones with extra features, not standard Cisco phone features.