The following instructions work great for SPP A-2770 except where it says that ZZ on a 2770 is always 00. The ZZ on A-2770 is 40 instead of 00 and it works great. You don't have to do all the handsets either just pick a number for the handset that is not in use from 1,2,3,4. The credit goes to summertimecrow who posted this message in the first place except I had to figure out the proper number to use for ZZ for a 2770 H-273 handset. ZZ=40 These are instructions I received to reprogram your SPPS 2720 handset to work with a base. Please n ..
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