Google Voice has been updated with “direct access numbers” to speed the process of placing calls.

Google Voice Blog explains:

Until today, the Google Voice app had to make a request to the Google Voice server every time you wanted to make a call to send us the phone number you wanted to dial. Then the call would be connected via a Google Voice access number. With direct access numbers, we assign a unique phone number to every person you call. This means that we no longer need to use your data network to access the server each time you make a call, so calls will be placed much faster.

So, update your Google Voice and you will be good to go.  [Google Voice Blog]

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