Residential Use
The patent "Selectively adding a third party to a collect call" ( US Pat No. 7,876,887) is suitable for residential use (i.e. useable outside of a prison/jail environment) to generate new revenues for phone companies by having a party who accepts a collect call to agree to pay for any third party added to the collect call.
Please visit the United States Patent and Trademark Office to see the entire patent - (US Patent 7,876,887).
Please visit the United States Patent and Trademark Office to see the entire patent - (US Patent 7,876,887).