Can you change the voice for twilio?

I'm using the verb on Twilio, and when the command is activated it says what ever text you put within the tag. Currently it's set to a male computer voice. I'm wondering if there are any options / ways to change the voice? I would prefer a female voice as they tend to sound better on the ph开发者_JAVA百科one. Thanks

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<Say voice="woman">Hello Phil</Say>

Documentation can be found here: http://www.twilio.com/docs/api/2010-04-01/twiml/say

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There is a new option: <Say voice="alice">Hello Phil</Say>. Alice allows setting of the language as well. It is not clear if Alice has improved pronunciation.