US 11,736,533 B2
Method and apparatus for implementing call service, electronic device and readable medium
Yongsheng Miao, Guangdong (CN); Jingxiang Liu, Guangdong (CN); and Lei Pan, Guangdong (CN)
Assigned to ZTE CORPORATION, Guangdong (CN)
Appl. No. 17/915,164
Filed by ZTE CORPORATION, Guangdong (CN)
PCT Filed Mar. 31, 2021, PCT No. PCT/CN2021/084552
§ 371(c)(1), (2) Date Sep. 28, 2022,
PCT Pub. No. WO2021/197386, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 202010246615.8 (CN), filed on Mar. 31, 2020.
Prior Publication US 2023/0117864 A1, Apr. 20, 2023
Int. Cl. H04W 74/08 (2009.01); H04W 16/28 (2009.01); H04W 56/00 (2009.01); H04L 65/1016 (2022.01); H04L 65/1073 (2022.01); H04W 8/04 (2009.01)
CPC H04L 65/1016 (2013.01) [H04L 65/1073 (2013.01); H04W 8/04 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method for implementing a call service, comprising:
deciding whether a first state of a terminal in a Mobile Switch Center enhanced for ICS (eMSC) is consistent with a second state of the terminal in an Internet Protocol Multimedia Subsystem (IMS); and
in response to an inconsistency between the first state and the second state, sending a registration request to the IMS to cause the terminal to complete an initial call service,
wherein the eMSC does not subscribe to registration state information in the IMS.