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SGSN Administration Guide, StarOS Release 21.22 - Serving GPRS Support Node (SGSN) Overview [Cisco ASR 5000 Series] - Cisco
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GGSN Administration Guide, StarOS Release 21.19 - GGSN Support in GPRS/UMTS Wireless Data Services [Cisco ASR 5000 Series] - Cisco
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SGSN Administration Guide, StarOS Release 21.22 - Serving GPRS Support Node (SGSN) Overview [Cisco ASR 5000 Series] - Cisco
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