What is fax CNG?

What is fax CNG?

CNG is the calling tone generated as a first indication of a fax call from the originating fax machine. The CNG tone is a pure tone with a frequency of 1100 ± 38 Hz (tone frequency tolerance is ± 38 Hz) with 0.5 seconds ON and 3 seconds OFF.

What is the fax tone called?

CNG tone

Do fax machines make noise?

Noises made during fax transmission could come during the process of transmission or during the process of printing. One reason behind the noise could be motivated electronically, since traditional fax messaging uses the phone line in sending or receiving datum.

What is Cisco fax relay?

Cisco Fax Relay is a proprietary fax relay implementation that uses Real-time Transport Protocol (RTP) to transport fax data. SCCP-enhanced features provide analog endpoint to analog endpoint interoperability within the IP telephony network.

How does t38 fax work?

T. 38 is an ITU protocol that dictates how fax audio traverses a packet-switched network, such as the Internet or a company’s LAN/WAN, reliably. In order for fax audio to traverse a packet-switched network like the Internet, the analog signal used by fax machines must be converted into digital packets.

What is fax relay?

Faxes communicate using basic HDLC frames that are modulated into audible sounds. Relay strips out the HDLC information carried by the modulated fax tones and then simply transports the fax HDLC information across the IP network using a fax relay protocol such as T.38.

Is Fax UDP or TCP?

38 allows the fax transmission to take place in real-time. In contrast to analog faxing in a normal telephone network, in which the faxes exchange information by means of tones, T. 38 uses the IP protocols TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) for data transmission.

What is fax protocol?

T. 38 is a protocol that describes how to send a fax over a computer data network. It is needed because fax data cannot be sent over a computer data network in the same way as voice communications. 38 is described in RFC 3362, and defines how a device should communicate the fax data.