6.3.1 Basic Call Establishment Connection Model for LCLS

23.2843GPPLocal Call Local Switch (LCLS)Release 17Stage 2TS

Figure 6.3.1.1 shows the network model for the basic call establishment for a Local Call. The oMSC server seizes one context with two bearer terminations in the oMGW. The bearer termination T1 is used for the bearer towards the oBSS and the bearer termination T2 is used for the bearer towards the iMSC selected iMGW. The iMSC server seizes one context with two bearer terminations in the iMGW. The bearer termination T6 is used for the bearer towards the tMSC server selected tMGW and the bearer termination T5 is used for the bearer towards the preceding oMGW. The tMSC server seizes one context with two bearer terminations in the tMGW. The bearer termination T3 is used for the bearer towards the iMSC selected iMGW and bearer termination T4 is used for the bearer towards the tBSS.

Connection Model 1: After Alerting, Backward Through Connection

Connection Model 2: After answer, Call is locally switched

Figure 6.3.1.1: Basic Call Establishment Connection Model for Local Call