sendFromNumber not working

We are using your .NET class TropoCSharp.Tropo to send SMS.  We are setting the sendFromNumber parameter in order to set the caller id of the message.  However, when a message is sent, the from number is always our Tropo account phone number.  How can I specify the phone number?  We are sending SMS messages on behalf of our customers, so we need to be able to set the from number.


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