The present invention relates to a telecommunications apparatus and a method, a storage medium, and a program for determining whether or not the other side communicating content data is located on a LAN or across a WAN. In step S13, the difference between a counter value in a received check packet and...http://www.google.de/patents/US20060153096?utm_source=gb-gplus-sharePatent US20060153096 - Telecommunications apparatus and method, storage medium, and program
