If you need the remote access code for the answering system, then the original (default) access code is given in the manual on page 50 (page 53 of the PDF) and on 55 (page 58 of the PDF). See the manual online at
https://att.vtp-media.com/ecp/documents/product_Product/364/UserManual/5977/SL82118_manual_i10.pdf . Unfortunately, if the remote access code has been changed, the default code will not work. As far as I know there is no way to reset the SL82318 remote access code to the factory default remotely. See page 50 of the manual to reset the phone's access code when you are using the handset. When you use the handset and start to change the code, the current remote access code will be announced first.
Any voice mail system would be accessed using the phone number and codes from your telephone service provider. This information will not correspond to the answering system of the SL82318.
I hope this helps.
Cindy Wells
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