VTech Contemporary Series A2100 Master User Manual page 43

Installation
Analog cordless 1-line/2-line accessory Petite - CTM-A241P/CTM-A242P
Accessory Petite registration
To register an accessory Petite to a CTM-A2411/CTM-A2411-BATT/CTM-A2421/CTM-A2421-BATT/CTM-A2510 telephone base:
When the telephone base is idle, press 123 and then press HOLD. The MESSAGE WAITING LED turns on for about 90 seconds.
Press 123 and then HOLD on the accessory Petite, the MESSAGE WAITING LED on the accessory Petite turns on for 90 seconds.
When the registration process completes, you hear 3 rising beeps as confirmation. When the telephone base has already
registered 4 cordless handsets or accessory Petite phones, one of the registered cordless handsets or accessory Petite phones
must be deregistered or registered to another telephone base before adding a new cordless handset or accessory Petite phone.
Accessory Petite deregistration
When a registered accessory Petite is idle, press *331734# and then press HOLD. You hear 3 rising beeps as confirmation when
the deregistration process completes.
Register an accessory Petite to another telephone base
Any analog cordless 1-line accessory Petite can register to any CTM-A2411/CTM-A2411-BATT/CTM-A2510 telephone base. Any
analog cordless 2-line accessory Petite can register to any CTM-A2421/CTM-A2421-BATT telephone base.
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