Avaya Trimline - Manual (Page 6)

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FIGURE 3 Setting the Ringer Volume Control (Desk and Trimline
Telephones)
4. Plug the other end of the cord into the telephone jack in your office.
Push the plug in until it clicks.
5. Turn your telephone over or for Trimline telephones, lift the handset
( Figure 3 ).
6. Set the ringer volume switch or thumbwheel to the setting you want.