Looking on how to program phone numbers or ext. on the buttons on 16 dc phones on an Electra Professional couldn't find it when googled
Thanks

The IPK user guide should be the same procedure;
Feature Access Keys
Note 1: Press the Redial key to insert a pause or Recall to store a
hookflash.
Note 2: The Busy Lamp Field status indication will be provided on the
keys programmed for DSS.
Station Speed Dial
(Outside Numbers)
DSS/BLF (Stations) and
Feature Access
1. Press the Feature key.
2. Press the Redial key.
3. Press the Feature
Access key to be
programmed.
4. Dial 0.
5. Dial the trunk access
code, i.e. 9 (if necessary).
6. Dial the telephone
number to be stored (16
digits maximum).
7. Press the Feature key
again.
1. Press the Feature key.
2. Press the Redial key.
3. Press the Feature
Access key to be
programmed.
4. Dial 1 and the station
number to be stored.
OR
Dial the feature access code
to be stored as indicated in
the Quick Entry Guide.
5. Press the Feature key
again.
Station Speed Dial — Dial Access
1. Press the Feature key.
2. Press the Redial key.
3. Dial the Speed Dial Memory location 80~99.
4. Dial the trunk access code, i.e. 9 (if necessary).
5. Dial the telephone number to be stored (24 digits maximum).
6. Press the Hold key (if entering a name) and dial the name of the
party (13 letters maximum).
7. Press the Feature key again
Note 1: Press the Redial key to insert a pause or Recall to store a
hookflash.
Note 2: Use the dial pad on the telephone when entering the name of
the party.

Google "Electra Professional User Guide" and this is the first entry

User Guide

There are also other features that may be available for you.