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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))"
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