No, Snom M300 and Snom M700 are designed to provide advanced mobility features like roaming and seamless handover, 3rd party DECT devices are not compatibile with the Snom DECT solution.

GAP Standard is not supported by Snom M300/700 base stations and M25/65/85 handsets.

Also the M25, M65 and M85 handsets can't be registered on 3rd party DECT bases.