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Voice Over IP VoIP Gateway Public Switched Telephone Network Signalling System No. 7 Asterisk Transparent PNG
GatewaySoftswitchTelephoneTextElectronics AccessoryTelephone ExchangeTechnologyAreaVoip GatewayPrimary Rate InterfaceAsteriskSignalling System No 7DiagramTelephonyTelecommunications BillingPublic Switched Telephone NetworkSystemVoice Over IpMode Of TransportCommunicationCallrecording SoftwareSession Initiation Protocol
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Voice Over IP VoIP Gateway Public Switched Telephone Network Signalling System No. 7 Asterisk Transparent PNG

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