View source for US Patent Application 17740133. MESSAGE-BASED NOTIFICATION THAT A CALLED PARTY IS BUSY simplified abstract

=MESSAGE-BASED NOTIFICATION THAT A CALLED PARTY IS BUSY=


==Organization Name==

[[Microsoft Technology Licensing, LLC]]


==Inventor(s)==

[[Tapas Kumar Sarkar of Hyderabad (IN)]]

[[Oinam Ibochouba Singh of Bangalore (IN)]]

[[Naveenraj C G of Cherthala (IN)]]

==MESSAGE-BASED NOTIFICATION THAT A CALLED PARTY IS BUSY - A simplified explanation of the abstract==


This abstract first appeared for US patent application 17740133 titled 'MESSAGE-BASED NOTIFICATION THAT A CALLED PARTY IS BUSY

==Simplified Explanation==

- The patent application describes a VoLTE network that combines 4G LTE and IMS networks.
- The network includes an application server that sends message-based notifications to user equipment when a previously busy called party is available to accept a new voice call.
- The CCBS service signalling flow, which allows for completion of communications to a busy subscriber, is modified in this network.
- Instead of automatically calling back the calling party, a notification in the form of an SMS message is sent.
- The SMS notification is sent using SIP proxy servers and an IP Short-Message-Gateway between the LTE and IMS networks.
- The IP Short-Message-Gateway appears as another application server to the IMS core.


==Original Abstract Submitted==

A VoLTE (Voice over Long-Term Evolution) network comprising 4G (4 generation) LTE and IMS (Internet Protocol Multimedia Subsystem) networks includes an application server configured to provide message-based notifications to user equipment of a calling party when a previously busy called party is free to accept a new voice call. In an illustrative embodiment, a CCBS (Completion of Communications to Busy Subscriber) service signalling flow described by 3GPP (3 Generation Partnership Project) technical specification TS 24.642 is modified to replace an automated CCBS recall (i.e., call back) to the calling party with a notification comprising an SMS (Short Message Service) message. The SMS notification is sent using Session Initiation Protocol (SIP) proxy servers implementing call session control functions (CSCF) in an IMS core that interoperate with an IP Short-Message-Gateway (IP-SM-GW) between the LTE and IMS networks that appears to the IMS core as another application server.