Tunneling of non-GSM signaling messages in a GSM based network to enable both non-GSM circuit service and GSM packet service to the mobile station

Granted: Nov 12, 2002 Filed: Sep 28, 1999

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.