An integrated services digital network (ISDN) connection is maintained between a wireless office environment type private cellular telephone system and a public access cellular telephone system. In particular, an mB+D ISDN connection (where m=2, 23 or 30) is maintained between the ISDN network...http://www.google.fr/patents/US5771275?utm_source=gb-gplus-shareBrevet US5771275 - Use of ISDN to provide wireless office environment connection to the public land mobile network
Use of ISDN to provide wireless office environment connection to the public ...
