Busy Redial and other similar features on some telephone systems

[the zak]

Besides the term Busy Redial for the feature at
http://smallbiz.verizonmarketing.com/products/voice/local/features/add_br.aspx
what other similar features are available on some other telephone
systems that automatically detect when the line you're calling is
activated?... useful for reaching people whose telephones haven't any
advanced features when there's no answer or a busy signal.

[h***@bbs.cpcn.com]

Besides the term Busy Redial for the feature athttp://smallbiz.verizonmarketing.com/products/voice/local/features/ad...
what other similar features are available on some other telephone
systems that automatically detect when the line you're calling is
activated?... useful for reaching people whose telephones haven't any
advanced features when there's no answer or a busy signal.

Click test. Press the tip against the jack sleeve and if you hear a
sharp click it means the line is busy.