Hi all, i  am working on Wince application, Registartion is sucesfully, when i make a call , i could hear noise, by looking @ the logs, i found  that, it uses GSM Codec, i wanted to know, where could i change the gsm codec to pmua and try testing it. or if not , what could be the problem.   Have a look @ my small web-page: http://www.geocities.com/muki_champs Regards, Mukesh Kumar, Sr.Software Engineer, Mobile Application Developer. Hyderabad. India.