I'm guessing from your question that what you are aspiring to do is create a way for a Japanese user to make an audio command to their phone to initiate a call in a way that a computer can parse it.
If I understand speech recognition issues, unlike the usual smartphone graphic interface where one can start by selecting the contact name and then choosing an action, like "email" or "phone", a voice command system usually needs to start with the general and work toward the specific.
In a normal environment which may have competing sounds and other people talking, it's way harder for a computer to listen for countless possible names as a starting point. Instead, you want to have a limited set of commands like "phone" or "email", which can prompt action. Thus, in English, "call Larry," where "call" initiates the phone's attentive listening.
Japanese always (insofar as you can make a claim like "always") ends sentences with the verb. In Japanese, one says, for example, 「太郎{たろう}に電話{でんわ}をかける」 (Taro/to/phone/I call)
. If I'm right about your technical challenge, this is not what you want.
To answer your second specific question first, no, there is no currently accepted, or expected, manner of talking to machines. So, on the upside, you have free reign to define your own standards.
The most direct and simple solution would be to say something like 電話{でんわ}
, followed by the name. It's equivelent in English to saying "Phone. Name." But that's clunky and no fun.
If the whole goal of your project is naturalness itself, I think you could do this 「電話{でんわ}を太郎{たろう}に掛{か}けなさい」
. It means "By phone/Taro/call". The 電話{でんわ}で
could function as the prompt for the machine to listen, as "call" does in English.
If you wanted to initiate other commands besides calling, you could do similar things like 「メールで太郎{たろう}に連絡{れんらく}しなさい」("By email/Taro/contact")
.
The key is to use で
, "by", as identifying the vehicle for the action before you give the name.
The なさい
at the end makes the sentence a firm command, which I think is appropriate given that this is a machine and they have to suck it up as our servents until they inevitably become our sentient overlords.
Hope that helps.