Accessories

Hey everyone. I have a Treo 700p and I just got the Plantronics Voyager 510 but I have a problem. I connect it to my Treo but I can only receive calls to my headset but I can't make them. If someone calls me, I can talk using the headset but when I dial my house, for instance, it acts as if the headset were not connected and the call goes to the handset even after I press the Call control button. If anyone can give me some advise on how to correct this or if I have a defective unit please let me know. Thanks in advance. 😁