The Norstar DR5.1 is a Software Cartridge required for NorstarModular 8x24 KSU. Includes the DR5.1 Software and Data Cartridge. All Norstar phones work with this software.

The DR5.1 software is compatible with all Fast Rads, ATA's, VMI, CTA's, NRU's, SMDR3 and higher, Norstar Applications Module (NAM), Startalk Flash, Startalk A, B, C and MINI Voicemails.

The DR5.1 software does NOT work with Caller ID.

Two Year Warranty