Maximum modem speed need for faxing

I must buy an external modem to allow my faxing software (Vsi-fax) to send messages.  Now knowing the maximum speed that modern fax machines can receive messages I am uncertain as to whether to buy a 19.2, 28.8, or a 57.6.  The modem will not be used for anything other than fax transmissions.  Can you give me some insight?
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Most faxes receive at 9600.  Some might handle 14,400.  Virtually ALL Modems sold today will be perfectly capable of faxing for you.  If the modem on the other end can't handle the speed, it will negotiate a slower connection.

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