Device information has not changed since the last retrieval.
Note: The API client must provide the "plcm-dma-local-cluster-list" representation's
ETag value in the "If-None-Match" HTTP header to ensure conditional
retrieval. This will improve network performance by reducing bandwidth
If the API client chooses to exclude an ETag value from a previous,
identical single deivce retrieval in the "If-None-Match" header, then
the HTTP response will contain the device representation in the message
The "plcm-dma-local-cluster-list" ETag can be accessed from the initial retrieval result's HTTP
response header. Also, subsequent retrievals require the identical domain and
user name to ensure an equivalent ETag value. This also assumes no other client made changes to
dmas on the server.