AT&T System 25 - Manual (Page 24)

Placing Calls
You can place calls to people inside and outside your company.
Your System Administrator will give you the required outside
line access code.
Placing Inside Calls
1 Lift the handset and listen for dial tone.
2 Dial the extension number.
Placing Outside Calls
1 Listen for dial tone.
2 Dial the outside line access code and listen for dial tone.
3 Dial the telephone number.
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