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More specifically something like "Hello [the telephone-specific version of 'Hello'], the act of being a dog occurs." It is understood by context that "dog desu" refers to the speaker, but if s/he wanted to be more clear, s/he could have prefaced it with "Watashi wa" (basically "as for me" or "relating to me").
Okay, that just about exhausted my Japanese other than the über-useful phrase "Watashi wa henne gaijin desu, Nihongo o wakarimasen" ("I'm a crazy foreigner, I don't understand Japanese", spoken in the very formal way).