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...the rest is Technology. Nodes in a Network. PSTN, Public Switched Telephone Network Cellular, from the cellular radio structure HLR, Home Location Register - Database PABX, Private Branch eXchange Gateways/Transits - Node to Node Switch e.g. International Gateways (MCI&MFS)
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Nodes in a Network • PSTN, Public Switched Telephone Network • Cellular, from the cellular radio structure • HLR, Home Location Register - Database • PABX, Private Branch eXchange • Gateways/Transits - Node to Node Switch • e.g. International Gateways (MCI&MFS) • STP, Signaling Transfer Point - Control • SCP, Service Control Point - Database
Call flows, examples • 1. PSTN - PSTN • 2. PSTN - Cellular (PCS or AMPS) • 3. Cellular (PCS) - Cellular (AMPS) • 4. Cellular - PABX (Regular number) • 5. Cellular - PABX (800) • 6. Cellular - International
PSTN - PSTN 578 => 578 5626 5626 => 578 5626
PSTN - Cellular Where? 673 => 673 4831 => <= Location! ID your phone 673 4831
Cellular (PCS) - Cellular (AMPS) Where? 673 => 673 4831 => <= Location! 673 4831 ID your phone
Cellular - PABX (Regular #) 705 7 => 705 => PABX 5 7769 => 705 7769
PABX Cellular - PABX (800 #) 222 9293 => 222 9293 = 214 997 1243 1 800 222 => <= 214 997 1243 997 1243 => 997 => 7 1243 => 1 800 222 9293
Cellular - International 011 46 => 8 757 => 011 46 => 0000 => 011 46 8 757 0000