Nortel i2021 Series User Manual page 26

The first three programmable keys should be lit. These three keys are the
default CA keys.
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In our example, we will enter DN 847-555-4736 with two CAs, DN 847-
555-1234 with 4 CAs, and DN 847-555-4321 with one CA. The first two
DNs will have a Bearer Service of Speech and the third will have a Bearer
Service of Audio.
To enter the first DN, press Change, and enter the first DN. Enter the DN
in a seven-digit format (no area code).
After the DN has been entered, press the Bearer softkey until the Bearer
Service of Speech is displayed.
i2021 ISDN Teleset
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NOTE: The first three CA keys lit is default. If
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the first three CA keys are not lit, or
there is a DN displayed, the Teleset is
not in the default condition.