ABTO Sofware offers custom HTML5 SIP Client development.

Our HTML5 SIP Softphone solution is JavaScript softphone implementation on the basis of WebRTC.

HTML5 SIP Client requires SIP server that accepts WebSocket connections.

Here is a short list of HTML5 SIP softphone's features:
*voice and video calls;
*IM (instant messaging);
*multiple lines and multiple accounts support;
*presence support;
*DTMF support.

Besides HTML5 SIP client, ABTO Software provides a range of VoIP products for different platforms.

Visit www.voipsipsdk.com for more details.