[global]
title	"Mobile Terminated (MT) call: Core network view"

[entities]
# define the entities in the system (in order)
a		"A (Caller)"
gmsc		"GMSC"
hlr		"HLR"
vmsc		"VMSC"
ms		"MS (Called)

[messages]
# define the protocol messages in-order
a	gmsc	"ISUP IAM[MSISDN]"

gmsc	hlr		"MAP SRI[MSISDN]"
hlr	vmsc		"MAP PRN[IMSI]"
vmsc	hlr		"MAP PRN-Res[MSRN]"
hlr	gmsc		"MAP SRI-Res[MSRN]"

gmsc	vmsc		"ISUP IAM[MSRN]"
vmsc	ms		"CC SETUP"
ms	vmsc		"CC CALL CONFIRMED"
ms	vmsc		"CC ALERTING"
vmsc	gmsc		"ISUP ACM"
gmsc	a		"ISUP ACM"
ms	vmsc		"CC CONNECT"
vmsc	gmsc		"ISUP ANM"
gmsc	a		"ISUP ANM"

a	gmsc		"ISUP REL"
gmsc	vmsc		"ISUP REL"
vmsc	ms		"CC RELEASE"
ms	vmsc		"CC RELEASE COMPLETE"