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msc {
hscale="3", wordwraparcs="1";
ue,hnb,hnbgw,sgsn,ggsn;
ue box hnb [ label = "Radio Channel Establishment, possibly already done by IMSI ATTACH / RAU" ];
ue => hnb [ label = "RRC (SM PDP CTX ACT REQ)" ];
hnb => hnbgw [ label = "RUA DT (RANAP DirectTransfer (SM PDP CTX ACT REQ))" ];
hnbgw => sgsn [ label = "SCCP DT1 (RANAP DirectTransfer (SM PDP CTX ACT REQ))" ];
sgsn => ggsn [ label = "GTP-C PDP CTX ACT REQ" ];
ggsn >> sgsn [ label = "GTP-C PDP CTX ACT ACK (IP+TEI of GGSN)" ];
sgsn => hnbgw [ label = "SCCP DT1 (RANAP Activate RAB Req (IP+TEI of GGSN)" ];
hnbgw => hnb [ label = "RUA DT (RANAP Activate RAB Req (IP+TEI of GGSN)" ];
hnb box ue [ label = "RAB Establishment" ];
hnb >> hnbgw [ label = "RUA DT (RANAP Activate RAB Resp (IP + TEI of HNB)" ];
hnbgw >> sgsn [ label = "SCCP DT1 (RANAP Activate RAB Resp (IP + TEI of HNB)" ];
sgsn => ggsn [ label = "GTP-C PDP CTX MOD REQ (IP + TEI of HNB)" ];
ggsn >> sgsn [ label = "GTP-C PDP CTX MOD RESP" ];
sgsn >> hnbgw [ label = "SCCP DT1 (RANAP DirectTransfer (SM PDP CTX ACT ACK))" ];
hnbgw >> hnb [ label = "RUA DT (RANAP DirectTransfer (SM PDP CTX ACT ACK))" ];
hnb >> ue [ label = "RRC (SM PDP CTX ACT ACK))" ];
}
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