This document provides an overview of telephony basics, including telephone switching, signaling, and the public switched telephone network. It describes key components like central offices, end office switches, tandem switches, and hierarchical versus dynamic non-hierarchical switching. The document also covers in-band and out-of-band signaling methods as well as signaling systems like multi-frequency signaling, R1, R2, SS7, and the North American SS7 architecture using signal switching points, signal transfer points, and signal control points.

1. This Lesson is UNCLASSIFIED//FOUO

2. U-4205L Telephony Basics Part 1

13. X939 X243 X757 X912 X210 X312 X556 X404 4a 4b 4c 4d 4e 3a 3b 3c 3d 3e 3f 3g 2a 2b 2d 1a 2c 1b Class 1 Region Class 2 State Class 3 County Class 4 City Class 5 Local 850-939-1122 850-939-3344 850-243-5566 912-656-7788 210-756-1111 1c PBX 50 Users T1 24 Channels Company BGI HIEARCHARY SWITCHING International Gateway High Use Route High Use Route

15. 939 243 656 712 T T Class 4 Class 5 404 CLEC Intelligent Network Uses Switching Points To Access The Signaling Network Dynamic Non-Hiearchical Routing T PBX 50 Users T1 24 Channels Company BGI 850-939-1122 850-939-3344 850-243-5566 912-656-7788 SSP SSP SSP SSP SSP SSP SSP T SSP SSP International Gateway

19. Inter-register 1(R1) Signaling USA 300 Hz 3400 Hz Voice Band 2600 Hz 2000 Hz In Band Signaling Frequency HZ 1 700 + 900 2 700 + 1100 3 900 + 1100 4 700 + 1300 5 900 + 1300 6 1100 + 1300 7 700 + 1500 8 900 + 1500 9 1100 + 1500 10 (0) 1300 + 1500 Control Signal 1700 + 700 -1300 System Check 1900 Idle Line 2600

20. Signaling System 5

21. 300 Hz 3400 Hz Voice Band 2000 Hz 3825 Hz (CCITT) Inter-register 2 (R2) Signaling Asia/Europe Frequency HZ 1 700 + 900 2 700 + 1100 3 900 + 1100 4 700 + 1300 5 900 + 1300 6 1100 + 1300 7 700 + 1500 8 900 + 1500 9 1100 + 1500 10 (0) 1300 + 1500 Control Signal 1700 + 700 -1300 System Check 1900 Idle Line 2600

23. Intelligent Signaling Signaling System 7 SS7 Network 939 939 T SSP SSP SSP 850-939-1122 850-939-3344 Service Switching Point (SSP) Service Transfer Point (STP) Service Control Point (SCP) STP STP

24. Associated Signaling SSP SSP T1 Circuit Signal

25. Non-associated Signaling SSP SSP T3 Circuit Signal T1

26. Non-associated Signaling SSP SSP T3 Circuit Signal STP STP

30. SSP SSP SSP Central Office 850-939-XXXX LOCAL CALL Within an Area Code and LATA Central Office 850-243-XXXX TANDEM Non-Toll

31. LOCAL CALL SSP SSP SSP STP SCP PSTN IN/SS7

32. Simplified SS7

33. This Lesson is UNCLASSIFIED//FOUO