I believe the DP5130 phone was designed to operate on the Toshiba CIX series of phone systems. Therefore not compatible.
On this page is a link to some user guides for the DK series (about 3/4 the way down the page)
http://pdf.textfiles.com/manuals/TELECOM-S-Z/For the Strata 16e I believe the only phones that will work are:
DKT2010-H 10-Btn
DKT2010-SD 10-Btn Speaker with Display
DKT2020-S 20-Btn Speaker
DKT2020-SD 20-Btn Display with Display
DKT2020-FDSP 20-Btn Display with Display and external jack for a mic.