How do you retreive messages from another phone on the att model 1719 answering machine?

Dial your number, when the AT&T 1719 answers and the announcement begins playing(if the unit's answer function is turned off, it will answer after 10 rings) dial your three digit security code(default is 500). If the announcement continues playing after entering the security code, press # to end the announcement or wait for the announcement to end and re-enter the security code. The answer machine will announce the number of messages then begin playback of the messages. I have included a link to the manual, remote operation of the AT&T 1719 answer machine is on page 8.

http://dl.owneriq.net/3/36b2e479-eaef-8ce4-d522-0a21f4138627.pdf