Telephone message storage and Voice mail

Voice mail and telephone message storage are semantically related In some cases you can replace phrase "Voice mail" with "Telephone message storage", this phrases are similar.

Voice mail noun - A computerized system for answering and routing telephone calls; telephone messages can be recorded and stored and relayed.

Telephone message storage and voice mail are semantically related in telephone message system topic. You can use "Telephone message storage" instead a noun phrase "Voice mail".