Hello, Valentina!
Flashphoner is exactly what you need.
It is software which allow you create your own flashphone easy.
You can creat click-to-call buttons or really flashphone with it. It is very simple in use and have detailed documentation.
Please check this -
www.flashphoner.com and this
docs.flashphone.com
Features:
Server
- Resampling Speex16 ↔ Speex8
- Transcoding Speex ↔ G.711
- Connect RTMP ↔ VOIP
- Support SIP 2.0
- Support DTMF
Client (free in complete)
- Flashphone - open source
- Click-to-Call button - open source
- Java Script API
Please check your PMB, or contact us by
support@flashphoner.com
We will help you with pleasure.