Panasonic analog phones plug into analog KSU's and have extension numbers beginning with 101. In additon, you can dial 0 to reach the phone programmed as Operator, and it's usually extension 101.
With the intercom dial tone (press INTERCOM or pick up the handset or press SP PHONE) you can start dialing codes defined in your number plan. You can also program left side buttons to monitor are directly select other extensions or dial codes to page all idle speakers in a 77xx phone.
Note this is specific to TA series systems, but the operation is similar in all Panasonic models.
Carl
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