| US 7,522,931 B2 | ||
| Method and apparatus for accessing a network computer to establish a push-to-talk session | ||
| Douglas J. Ranalli, Andover, Mass. (US); David P. Peek, Atkinson, N.H. (US); and Robert H. Walter, Westford, Mass. (US) | ||
| Assigned to Netnumber, Inc., Lowell, Mass. (US) | ||
| Filed on Mar. 18, 2004, as Appl. No. 10/802,935. | ||
| Application 10/802935 is a continuation in part of application No. 10/302882, filed on Nov. 25, 2002, granted, now 6,748,057. | ||
| Application 10/302882 is a continuation of application No. 09/456646, filed on Dec. 08, 1999, granted, now 6,539,077. | ||
| Application 09/456646 is a continuation in part of application No. 09/226901, filed on Jan. 08, 1999, abandoned. | ||
| Application 09/226901 is a continuation in part of application No. 09/092764, filed on Jun. 05, 1998, granted, now 6,292,799. | ||
| Prior Publication US 2004/0192364 A1, Sep. 30, 2004 | ||
| Int. Cl. H04W 4/00 (2009.01); H04B 7/00 (2006.01); H04L 12/16 (2006.01); H04Q 11/00 (2006.01) | ||
| U.S. Cl. 455—518 [455/519; 455/435.1; 370/262] | 21 Claims |
| 8. An apparatus comprising:
a push-to-talk (PTT) server of a mobile operator's PTT system including means for extending the PTT system to enable a registered
user of the PTT system to initiate a PTT session with unregistered end-user equipment which is not registered for PTT service
with any mobile operator's PTT system, the unregistered end-user equipment comprising a destination network computer having
PTT functionality and being accessible on a public data network;
the PTT server containing means for querying an external directory service database, accessible on a public data network,
with a unique identifier to obtain a PTT address for the unregistered end-user equipment, and
means for initiating a PTT session with the unregistered end-user equipment.
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