Message authentication enables detection of any alteration to data to and from IP Office. To support authentication, the originator of the data also sends a signature (called a hash) of the data sent. The receiver can then check that the data and the signature received match.

The IP Office can authenticate data using the following algorithms:

In general, the larger the hash size, the more secure the signature. However smaller hash sizes require less processing.

IP Office supports message authentication using the Transport Layer Security (TLS) 1.0, 1.1, and 1.2 protocol.