PSTN

1000	VoIP
662	ISDN
657	telephony
630	modem
600	broadband
597	GSM
586	wireless
585	IP
580	modems
578	telephone

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PBX DSL Ethernet ADSL subscriber SIP routers landline dial TCP GPRS LAN phones protocols VPN protocol WiFi connectivity bandwidth phone interfaces ISP mobile servers server telephones networks interconnect Wi Switched handset router SS7 messaging Mbit Broadband dialing functionality VOIP

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