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US006751207B1
(12) United States Patent ao) Patent No.: us 6,751,207 Bi
Lee et al. (45) Date of Patent: Jun. 15,2004
(54) TUNNELLING VOICE OVER THE
INTERNET PROTOCOL IN A CELLULAR
NETWORK
(75) Inventors: Jau Young Lee, Pleasanton, CA (US);
William C. Y. Lee, Danville, CA (US)
(73) Assignee: Cellco Partnership, Bedminster, NJ (US)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 761 days.
(21) Appl. No.: 09/620,639
(22) Filed: Jul. 21, 2000
Related U.S. Application Data
(60) Provisional application No. 60/145,870, filed on Jul. 27, 1999.
(51) Int. CI. II04Q 7 24
(52) U.S. CI 370/338; 370/401; 370/402
(58) Field of Search 370/338, 351,
370/352, 353, 356, 395.52, 400, 401, 403, 389, 392, 341, 349, 329, 354, 402; 455/432, 433, 455, 555, 556
