Switch Configuration, NSS, NSN, Ericsson, Huawei, HLR, VLR, GMSC, GGSN, SGSN, GSM, WCDMA, LTE, 4G, 3G, UTRAN, Node B, Sigtran, M3UA, SCTP, SCCP, MTP, Map, SS7, SIP, VOIP, IP Telephony, SMSC, VAS, Roaming, Ip Routing, PPP,

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