Telecommunications system

This invention relates to a telecommunications system, and to a method of operation thereof. More particularly, the invention relates to a telecommunications network using Internet Protocol (IP), and specifically to a system for handling emergency calls in such a network. There is described a system...

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Main Authors Lindgren, Hans ke, Stille, Mats Ola
Format Patent
LanguageEnglish
Published 10.08.2004
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Abstract This invention relates to a telecommunications system, and to a method of operation thereof. More particularly, the invention relates to a telecommunications network using Internet Protocol (IP), and specifically to a system for handling emergency calls in such a network. There is described a system which, in a voice over IP radiotelecommunications system, allows a mobile station to make an emergency call, even though other calls would not be allowed at that time.The mobile station includes an emergency call indication in the session activation request, and this is recognized by the network nodes, which then allow call set up.
AbstractList This invention relates to a telecommunications system, and to a method of operation thereof. More particularly, the invention relates to a telecommunications network using Internet Protocol (IP), and specifically to a system for handling emergency calls in such a network. There is described a system which, in a voice over IP radiotelecommunications system, allows a mobile station to make an emergency call, even though other calls would not be allowed at that time.The mobile station includes an emergency call indication in the session activation request, and this is recognized by the network nodes, which then allow call set up.
Author Stille, Mats Ola
Lindgren, Hans ke
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References (1109416) 20010600
Ronneke (6515989) 20030200
Satyabrata Chakrabarti et al.: "A Network Architecture For Global Wireless Position Location Services", Vancouver, CA, US, Jun. 6-10, 1999, New York, NY: IEEE, Jun. 6, 1999, pp. 1779-1783, XP000903675, ISBN: 0-7803-5285-8.
M. Korpi et al.: "Supplementary Services in the H.323 IP Telephony Network", IEEE Communications Magazine, US, IEEE Service Center, Piscataway, NJ, vol. 37, No. 7, Jul. 1999, pp. 118-125, XP000835313, ISSN: 0163-6804.
Farris et al. (5881131) 19990300
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Clise et al. (5797091) 19980800
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Jeffrey H. Reed et al.: "An Overview of the Challenges and Progress in Meeting the E-911 Requirement for Location Service", IEEE Communicatons Magazine, US, IEEE Service Center. Piscataway, NJ, vol. 36, No. 4, Apr. 1, 1998, pp. 30-37, XP000752568.
J. Wang et al.: "Wireless Voice-Over-IP and Implications for Third-Generation Network Design", Bell Labs Technical Journal, US, Bell Laboratories, vol. 3, No. 3, Jul. 1, 1998, pp. 79-97, XP000782375, ISSN: 1089-7089.
Henning G. Schulzrinne et al.: "The Session Initiation Protocol: Providing Advanced Telephony Services Across the Internet", Bell Labs Technical Journal, Oct. 1998, XP002164648.
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