Method for routing a call to a roaming mobile unit
CA 2390809 A1 · Owner: Lucent Technologies Inc. · Inventors: Yao, Jie; Yang, Zhongjin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A calling phone (110) initiates a call request to a roaming mobile unit (160). The call request is routed to the home MSC (140) of the called roaming mobile unit (160). The home MSC (140) routes the call request to the mobile unit (160), and upon answering by the called mobile unit (160) a, first voice path is established between the calling phone (110) and the roaming mobile unit (160). The serving MSC (150) initiates backward signaling to the switch (120) to set up a second voice channel that does not traverse the home MSC (140). The voice signals from the call are then transferred to the second voice channel and the links from the first voice, channel are released.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed June 17, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 17, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 2024.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.