AT&T System 25 - Manual (Page 15)

Following
You can have personal calls sent to another phone by using the
Following or the Forwarding feature. To use the Following
feature, at a telephone other than your own, you sign in your
extension number. To cancel the request, you may either sign
out your extension number from that other phone, or sign back
in at your own telephone.
Although Following and Forwarding send your calls to another
telephone, the two features differ slightly. Read the information
and procedures for both, and then use the feature that is
suitable.
Signing In
1 Listen for
2 Dial your
3 Dial your
4 Listen for
dial tone, then press * * .
❑ ❑
own extension number.
extension number again.
confirmation tone, then hang up.
Signing Out
1 Listen for dial tone, then press * * .
❑ ❑
2 Dial your extension number.
3 Dial 0 .
❑
4 Listen for confirmation tone, then hang up.
Signing Out All Extensions
This procedure signs out all extension numbers that have been
signed in at this telephone except for the extension normally
assigned to it.
1 Listen for dial tone, then press * * 0 .
❑ ❑ ❑
2 Listen for confirmation tone and hang up.
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