Overview
The MicroSIP Softphone is a Windows-based softphone that can be used to test VOIP/SIP phone calls and SIP instant messaging. You must have a VOIP/SIP account to use this softphone.
Warning: if your computer does not have sound, pressing a button on the softphone keypad may not register the DTMF code (e.g. testing TopView alarm acknowledge). See the bottom of this post for more details and possible workaround.