CallFire designs , develops , and offers web - based VoIP products and services as a business - to - businesses ( B2B ) service for small and medium sized - businesses ( SMB 's ) and bills customers based on usage .
CallFire designs , develops , and offers web - based VoIP products and services . 
 The company offers and markets its products as a business - to - businesses ( B2B ) service for small and medium sized - businesses ( SMB 's ) and bills customers based on usage .