Bell System Practices AT&T 502 Reference page 23

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Fig. 14-- 5 58C/D Telephone Set Connedlona, 2-Line Pickup, Signaling, Exclusion, and Control Leads
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NOTES:
I. FOR SET CONNECT IONS TO lA HOME INTER PHONE OR
SPEAKERPHONE SYSTEM REFER TO RESPECTIVE SECTION.
2.
(G) LEAD IS CONNECTED TO F TERM INAL IN DIAL SETS
AND TO RR TERMINAL I N MANUAL SETS.
3.
USE A AND A I CONTROL LEADS ON I - L I N E
FEATURES ONLY.
425E NETWORK
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