Complete Communications Engineering


The VOCAL SAMS for Facsimile (SAMS-F) is a solution for interoperating with legacy fax modems without the need for modem banks with E1/T1/ISDN connections.

As E1/T1/ISDN lines are increasingly being replaced by Ethernet based VoIP systems, companies are often left with modem based technology that can no longer work with the new infrastructure. This however is unacceptable for many businesses where FAX documents remain critical for operations. VOCAL has a number of solutions to solve these problems.

Request Brochure for SIP Analog Modem Server for Facsimile (SAMS-F)

VOCAL’s Virtual Modem Servers allows a business to deploy a server in the cloud, which can work with the modern VoIP phone network infrastructure, based on SIP and RTP, instead of necessitating T1/E1/ISDN lines to connect to the PSTN. The VOCAL Virtual Modem server contains true soft-modems, not just an AT command set on a TCP socket, pretending to be a modem. This allows the server to connect to true voice-band fax machines and fax modems deployed on the PSTN, and thus does not require installation of additional equipment on the far end of the system. The server is controlled by industry standard AT FAX commands via standard TTY nodes in the server’s filesystem – just as if it were a box-modem on a serial connection. This allows it to easily fit into currently existing systems. Many other configurations and methods of control are available in order to flexibly meet the needs of already deployed infrastructure and applications. In addition, VOCAL can customize or build to suit, in order to meet very specific system requirements.

Fax over IP (FoIP) solutions, can work in a few ways. They can treat fax modem audio signals as simple data, which may be packetized and transmitted in real-time over IP networks. Audio tones are sampled and digitized at (or near) the source, the data packets are transmitted over IP networks using VoIP protocols, and demodulated at the destination. As such, Fax over IP eliminates POTS lines and associated expenses. However it does not eliminate the use of the encoding and decoding modem audio at the source and destination nor the modem banks at the ISP. This allows for compatibility with existing Fax machines.

FoIP solutions can also work by directly sending T.38 FoIP data directly to IP network, without modulating the data on the IP end. The telephone network utilizes T.38 gateways, with which the FoIP endpoint can communicate. The T.38 gateway in the network will modulate the data and send it to the far end endpoint, which again can be already existing, standard Fax machines.

The SAMS-F Software is part of a fully integrated and highly configurable VoIP software solution with a Network Stack, SIP Stack, secure communications, full-featured Telephony software, and a comprehensive fax protocol and fax modem software library.


Fax Modulations

Request Brochure for SIP Analog Modem Server for Facsimile (SAMS-F)

More Information

supported platforms for SIP Analog Modem Server for Facsimile (SAMS-F)

VOCAL’s solution is available for the above platforms. Please contact us for specific supported platforms.