Session Initiation Protocol (SIP) is the most commonly used VoIP signalling protocol. Fax Voip Softphone can be configured as standard SIP client. Multiple SIP registrations are supported.
H.323 is one of the standards used in VoIP. Fax Voip Softphone is able to operate as independent H.323 endpoint or can register with H.323 gatekeeper (GK).
You can make voice calls via VoIP using 3 Fax Voip Softphone lines. An active call can be placed on hold. With Music On Hold function, you can play music when your callers are on hold.
T.38 - the most reliable standard used to transmit faxes over VoIP in real time. Isolates from the delays, timing jitter, and packet loss experienced in VoIP networks.
Transmitting a fax over voice codec. Can be used with VoIP providers that don't support T.38 but provide good-quality voice channel.
Using Fax Soft Virtual Printer, you can create a fax from any Windows application. Some file formats (PDF, TIFF, JPEG) can be converted into fax directly.
With Call Recording function you can record your telephone conversations over VoIP. Call recording can be started or stopped at any time.
Softphone can play audio files into the telephone line. You can send audio message with dialing number or when voice call is already established.
Call Forwarding and Call Transfer features allows you to redirect an incoming or existing telephone call to another destination. Both standard and Hairpin (2 call legs) mechanisms are supported.