ESC Softphone for IAX allows you to use your Microsoft Handheld or Pocket PC to make VOIP calls using the popular IAX protocol. It can connect to Asterisk VOIP servers via Wifi or 3G. Supports GSM Codec. Has integration with Outlook Address Book and allows calls to be made from the contact list of Outlook. Has been tested on Wifi and 3G Networks with good voice quality and slight adjustments in Jitter buffer settings (reduce Jitter buffer to minimum). Demo version available for download but limited to 2 minute calls and max of 20 called numbers before it expires. Once you have purchased a product and we have received confirmation from Handango, we will send you the full version of the product. You need to install the full version and give us the device key so we can activate your software.