Post on 31-Dec-2015
description
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
Cellular - PABX (800 #)
1 800 222 9293
1 800 2
22 =>
7 1
243 =
>
PABX
222 9293 =>
222 9293=
214 997 1243
<= 214 997 1243
997 =>997 1243 =>