The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 26, 2011
Filed:
Oct. 19, 2007
Youzhu Shi, Shenzhen, CN;
Youzhu Shi, Shenzhen, CN;
Huawei Technologies Co., Ltd., Shenzhen, Guangdong Province, CN;
Abstract
A method for realizing ring back tone in communication system, enabling that the calling user can only hear the ring back tone triggered by the primary called user no matter whether the call is forwarded or how it is forwarded. In the present invention, service control unit sets a mark indicating not to request ring resource in Invite message initiated to the forward user, and indicating the backward service control unit not to request triggering the ring resource. Optionally, service control unit only sends ringing message forwardly when it receives the backward ringing message and succeeds to request ring resource, and when it receives the backward ringing message, if service control unit has ever initiated call forward, then it deactivates backward ring resource. Optionally, each service control unit requests ring resource respectively, and forwards it when it receives 200 OK, where a mark indicating it coming from ring resource is set; service control unit deactivates backward ring resource, if it finds the mark in the backward 200 OK.