For quick operation If you are an operator or dial some extensions frequently, DSS buttons are useful.
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Hands-free Operation You can make an intercom call and have a conversation in hands-free mode using the SP-PHONE button (refer to "1.3.31 Hands-free Operation").
To confirm number before dialing, you can enter a phone number and confirm it on the display and then go off-hook. (Predialing)
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To make a call to another party without going on-hook, press the FLASH/RECALL button. It will re-access the CO line and provide external dial tone. Pressing the Terminate button will provide intercom dial tone. You can dial the new phone number without going on/off-hook.
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Hands-free Operation You can make an outside call and have a conversation in hands-free mode using the SP-PHONE button (refer to "1.3.31 Hands-free Operation").