Yealink SIP-T54S Administrator's Manual page 49

Connect the optional expansion microphones (only applicable to CP860 IP phones)
5.
Connect the optional PC (only applicable to CP860)
6.
Connect the mobile device (only applicable to CP860)
7.
Connect the optional expansion PSTN box CPN10 (only applicable to CP860/CP920 IP
8.
phones)
The optional accessories are not included in packaging contents. You need to purchase them
Note
separately if required.
Attaching the Stand and the Optional Wall Mount Bracket (not
Applicable to CP860/CP920 IP phones)
To attach the stand and the optional wall mount bracket:
For SIP-T54S/T52S:
Desk Mount Method
Wall Mount Method (Optional)
Getting Started
23