Happy to inform that RayTalk could supply two way radio accessories for your Caltta DH5 and PH6 series devices using 18pin, including Survillance Kit Earpiece, Earhook Earpiece, Light Weight Headset, Noise canceling headset, speaker microphone, and other spare parts.
Following few pictures for reference;
Would you like to have a try? Samples are welcomed for testing before mass production.