This syntax is used as means of identifying the reasons
for a device registration error. Following are possible reason
of registration status value.
noError: No Error
unknown: Unknown error cause
configurationError: Device configuration error
deviceNameUnresolveable: Unable to resolve the device name
to an IP address
maxDevRegReached: Maximum number of device
registration have been reached
connectivityError: Call agent is unable to establish
communication with the device
during registration
initializationError: An error occurred during
initialization of the device
deviceReset: Indicates that the error was due to
device reset.