Based on this product's specifications, here are some alternatives and similar models
DECT base station Mitel RFP 45
Summary description:
The Mitel RFP 45 DECT base station supports 12 channels and features voice codecs G.711, G.722, and G.729ab. It is designed in white with a durable ABS housing and has an IP20 safety rating. Operating on an input voltage of 37 - 57 V, its compact dimensions of 150 x 40 x 150 mm and lightweight design (327 g) make it an ideal choice for efficient communication solutions.