If a user is in an active call and decides to call someone else, the first conversation is put on hold. By clicking “resume” on either call, the active conversation can be toggled between callers.
The new “hold” feature is available regardless of whether you are conducting multiple calls or not, as software engineer Richard Dunn explained in a post on the official Gmail blog:
Whether you make a second call or not, you can now put any call on hold — useful in case you need to talk to someone in the room or grab something off the stove. Just press the “Hold” button and then “Resume” to start talking again.
This feature works across all call types (voice, video, and phone); the only restriction is that a maximum of two outgoing calls to physical phones can be placed at once.
Do you use Gmail to call people? Will you make use of the new multiple calls feature? How about Google launching this outside of the US? Answers in the comments box, below this post.
Source: The Official Gmail Blog