Free PC to PC phone. Pc to Phone & Phone to Phone

GTPhone Dialer Technical Specifications

Call Control Capabilities

  • It uses Microsoft's G.723.1 voice compression codecs therefore works very well on Windows based machines.
  • Fully complies with ITU-T H.323 latest recommendations.
  • Direct IP call model (for PC to PC phone call).
  • Speakerphone capabilities with a real-time host based acoustic echo canceller.
  • Volume and gain control.
  • USB handset and headset support.
  • Headset support.
  • Selection of the audio device used by the softPhone (audio cards must be full-duplex).
  • Fast connect procedure.
  • Overlap sending.
  • Gateway IP call model (for PC to PSTN phone call).
  • Selection of the network adapter used by the softPhone
  • Voice jitter buffer.
  • Real time audio streaming.
  • Supports VAD (Voice Activity Detection) and CNG (Comfort Noise Generation).
  • Speech codecs supported: G.711 (a-law, u-law), G.723.1, G.729A, and others upon request.
  • Fast start and H.245 tunneling
  • Support DTMF in following format: 1)Q.931 Keypad 2)H.245 String 3)H.245 Signal 4)RFC 2833.
  • H.235 security authorization based on MD5.
  • Interoperability: Interoperable with most softphones,IP-Phones,Gateways,Gatekeepers, IP-PBX and other VoIP entities.

Coming Soon:

  • Address book and ILS directory.
  • Dual-standard -H.323/SIP.


Operating systems supported

  • Works well on all versions of Microsoft Windows (Like 95, 98, 98SE, Millennium, NT4, 2000, XP, 2003).

Hardware Requirements

  • Any machine with any version of Windows running on it.
  • 5 MB of free hard disk space.
  • Full duplex sound card with microphone and speakers are required for audio support.

Network Connection

  • 28.8 kbps modem or faster, ISDN, LAN or fast Internet connection recommended.


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