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This depends on the context.

In person in a small group, you'd say "Hi! I'm James!" and probably extend your hand to shake.

If you are in front a of a room of strangers introducing yourself, you might be more formal, with "My name is James".

However, if you're joining a conference call, you'd say "Hi! This is James." That's because you expect that the people you are talking to probably know who you are, or at least could look at the list of invitees, but they don't necessarily know that this voice is yours.

This depends on the context.

In person in a small group, you'd say "Hi! I'm James!" and probably extend your hand to shake.

If you are in front a of a room of strangers introducing yourself, you might be more formal, with "My name is James".

However, if you're joining a conference call, you'd say "Hi! This is James." That's because you expect that the people you are talking to probably know who you are, or at least could look at the list of invitees, but they don't necessarily know that this voice is yours.

"Hello, this is James" was also a common way for someone named James to answer the phone, back in the days when phones were more tied to a location than individual devices as mobiles are today.

In my experience, this is context-dependent. In person in a small group, you'd say "Hi! I'm James!" and probably extend your hand to shake. This is also what you'd do if you're in front of a room introducing yourself — "My name is James" would also work there, especially if you're not the main speaker in a talk or something.

However, if you're joining a conference call, where you expect people know who you are but as a courtesy because you don't necessarily expect them to be able to distinguish your voice, you'd say "Hi! This is James."

In the second situation, the people who you are introducing yourself to know what your name is; they just don't know that this voice is you.

And, you might do the same even if there's video, for people who might not be getting the video or similar.

This depends on the context. 

In person in a small group, you'd say "Hi! I'm James!" and probably extend your hand to shake.

If you are in front a of a room of strangers introducing yourself, you might be more formal, with "My name is James".

However, if you're joining a conference call, you'd say "Hi! This is James." That's because you expect that the people you are talking to probably know who you are, or at least could look at the list of invitees, but they don't necessarily know that this voice is yours.

In my experience, this is context-dependent. In person in a small group, you'd say "Hi! I'm James!" and probably extend your hand to shake. This is also what you'd do if you're in front of a room introducing yourself.

However, if you're joining a conference call, where you expect people know who you are but as a courtesy because you don't necessarily expect them to be able to distinguish your voice, you'd say "Hi! This is James."

And, you might do the same even if there's video, for people who might not be getting the video or similar.

In my experience, this is context-dependent. In person in a small group, you'd say "Hi! I'm James!" and probably extend your hand to shake. This is also what you'd do if you're in front of a room introducing yourself — "My name is James" would also work there, especially if you're not the main speaker in a talk or something.

However, if you're joining a conference call, where you expect people know who you are but as a courtesy because you don't necessarily expect them to be able to distinguish your voice, you'd say "Hi! This is James."

In the second situation, the people who you are introducing yourself to know what your name is; they just don't know that this voice is you.

And, you might do the same even if there's video, for people who might not be getting the video or similar.