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MSC1

HLR for all 718-555 numbers. SS7 Network. HLR. PSTN Switch C. VLR2. PSTN Switch D. 2. VLR1. 2. 5. MSC2. 415-555. 3. MSC1. 2. 1. PSTN Switch A. 718-555. 2. PSTN Switch E. 3. 1. PSTN Switch B. 1. Link weights (used for shortest-path routing). 718-555-1234.

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MSC1

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  1. HLR for all 718-555 numbers SS7 Network HLR PSTN Switch C VLR2 PSTN Switch D 2 VLR1 2 5 MSC2 415-555 3 MSC1 2 1 PSTN Switch A 718-555 2 PSTN Switch E 3 1 PSTN Switch B 1 Link weights (used for shortest-path routing) 718-555-1234 212-555-5672 Signaling link Trunk

  2. yes no no no ignore frame discard frame Receive message send ACK Location query Response discard frame Message type? Generate ACK; Wait for SIFS Type of response? Registration Notification Is mobile currently located in home area Reg. canc. response Generate reg. cancellation; start timer yes Generate reg. notification response Timer expired Type =Data? yes Start timer yes no; then ACK Waiting for ACK? yes Feed to second module Flow chart for HLR - INCOMPLETE no discard frame

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