In a push-to-talk communications network, a method of transmitting a message from a sending device to a set of receiving devices is disclosed. The method includes selecting the set of receiving devices from a contact list on the sending device, such that each of the receiving devices has an address on...http://www.google.com/patents/US20060046757?utm_source=gb-gplus-sharePatent US20060046757 - Methods of transmitting a message to a message server in a push-to-talk network
