The General Patent Corp. International announced a licensing agreement on January 15, 2008 between Digitial Technology Licensing (DTL) and Nokia.

The patented technology is an audio data compression algorithm used for speech coding, which is used in GSM cell phone communications. This technology also provides backward compatibility, which allows cell phones to communicate with older technology in cellular towers.

DTL is also pursuing litigation with Verizon Wireless, T-Mobile, Spring/Nextel and Motorola for infringement of the DTL patent, which is called Digital Output Transducer.