REGISTER FOR AND METHOD OF PROVIDING CONTACT INFORMATION FOR A COMMUNICATIONS UNIT IDENTIFIED BY A UNIFORM RESOURCE NAME

A method of and register for obtaining information required to contact a communications unit is disclosed. The method includes: accessing a accessor location register, containing uniform resource names (URNs) cross referenced to uniform resource locators (URLs), to determine whether a URL corresponding to a URN for the communication unit is available; when the URL is available; initiating, using the URL, a first contact attempt with the communications unit; and contacting, using the URN, a home location register to validate the URL; and when the URL is not available; contacting, using the URN, the home location register to obtain the URL and then, using the URL, initiating a second contact attempt with the communications unit.