diff --git a/gprs_pdp_ctx_act_kernel.lad b/gprs_pdp_ctx_act_kernel.lad
new file mode 100644
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+[global]
+title	"GPRS PDP Context Activation (L3 only)"
+
+[entities]
+# define the entities in the system (in order)
+ms	"MS"
+bss	"BSS"
+sgsn	"SGSN"
+dns	"DNS"
+ggsn	"GGSN daemon"
+kernel	"GGSN kernel"
+inet	"Internet"
+
+[messages]
+# define the protocol messages in-order
+ms	bss	"L1 RACH burst"
+bss	ms	"RLC/MAC establishment"
+ms	sgsn	"LLC (SM PDP CONTEXT ACT REQ)"
+sgsn	dns	"DNS query A record of APN"
+dns	sgsn	"DNS response IP address of GGSN"
+sgsn	ggsn	"GTP-C (PDP CONTEXT ACT REQ)"
+ggsn	kernel	"Create Tunnel"
+kernel	ggsn	"Create Tunnel Confirm"
+ggsn	sgsn	"GTP-C (PDP CONTEXT ACT ACK)"
+sgsn	ms	"LLC (SM PDP CONTEXT ACT ACK)"
+ms	sgsn	"LLC (SNDCP (encapsulated IPv4))"
+sgsn	kernel	"GTP-U (encapsulated IPv4)"
+kernel	inet	"IPv4 packet"
+inet	kernel	"IPv4 packet"
+kernel	sgsn	"GTP-U (encapsulated IPv4)"
+sgsn	ms	"LLC (SNDCP (encapsulated IPv4))"