It could be creat your own VoIP product depends on our SDK.
Edit by : We believe that our customers deserve nothing short of best. To cater the varied communication needs of our clients and deliver superior solutions and services in Softphone. Our first model is Sealine Softphone for Desktop, which is the basic model of SIP Softphone especially designed to give you a soothing communication experience. Every model of SIP Softphone is crafted out while keeping the various requirements of our clients. This Softphone comes with the following set of features

Features:

* SIP Proxy authentication.
* Dial/Receive phone calls.
* Multi-lines support.
* Multi-party voice conference.
* Line Hold.
* Call transfer.
* Encrypt SIP account settings.
* Acoustic echo cancellation or suppression.
* Noise Cancellation or suppression.
* AGC (auto gain controller).
* Record conversation into wave (.wav) file.
* Play wave (.wav) file to the remote end.
* Friendly to NAT and other firewalls.
* Keep-alive packets to NAT/firewall.
* Narrowband, wideband voice codecs.
* Adaptive Jitter buffer.
* Packet Loss Concealment.
* DTMF tones generation.
* DTMF tones detection.
* Do Not Disturb (DND).
* Mic & Speaker Volume.
* Microsoft Autenticode Certificate.
* Works with all kind of Internet connections.
* Free product version upgrades. you can free download SIP ActiveX SDK 2.2 now.