Internet protocol multimedia subsystem (ims) call setup time booster

A system for establishing an Internet Protocol (IP) multimedia call with decreased Call Setup Time Key Performance Indicator (CST KPI) from an originating user equipment (UE) in a mobile telecommunications network, the system comprising:

• the originating UE, wherein the originating UE is configured to:
• initiate the IP multimedia call from the originating UE to a terminating UE;
• transmit a session initiation protocol (SIP) call initiation message from the originating UE to a terminating Proxy-Call Session Control Function (P-CSCF) through an originating Serving-Call Session Control Function (S-CSCF);
• and
• request the creation of a wake-up message via a network element upon receiving the SIP call initiation message;
• wherein the wake-up message is configured to bypass a plurality of network application servers (ASs), to start switching a transition of the terminating UE from an idle state to a connected state before the SIP call initiation message reaches the terminating P-CSCF.

A computer-readable storage medium comprising instructions for decreasing a Call Setup Time Key Performance Indicator (CST KPI) of an Internet Protocol (IP) multimedia call in a mobile telecommunications network, wherein the instructions, when executed by a computer, cause the computer to carry out the following steps:

• initiating the IP multimedia call from an originating user equipment (UE) to a terminating UE;
• transmitting a session initiation protocol (SIP) call initiation message from the originating UE to a terminating Proxy-Call Session Control Function (P-CSCF) through an originating Serving-Call Session Control Function (S-CSCF);
• and
• creating a wake-up message via a network element upon receiving the SIP call initiation message;
• wherein the wake-up message bypasses a plurality of network application servers (ASs) to start switching a transition of the terminating UE from an idle state to a connected state before the SIP call initiation message reaches the terminating P-CSCF.