Cisco Systems ATA187I1ARF manual Fax Services, Methods Supported

Chapter 1 Cisco ATA 187 Analog Telephone Adaptor Overview

Software Features

•V.44

•K56Flex

•ITU-T V.34 Annex 12

•ITU-T V.34

•V.32bis

•V.32

•V.21

•V.22

•V.23

Fax Services

The ATA 187 supports two modes of fax services, in which fax signals are transmitted using the G.711 codec:

•Fax pass-through mode—Receiver-side Called Station Identification (CED) tone detection with automatic G.711A-law or G.711µ-law switching.

•T.38 Fax Relay mode: The T.38 fax relay feature enables devices to use fax machines to send files over the IP network. In general, when a fax is received, it is converted to an image, sent to the T.38 fax device, and converted back to an analog fax signal. T.38 fax relays configured with voice gateways decode or demodulate the fax signals before they are transported over IP.

Note Success of fax transmission depends on network conditions and fax modem response to these conditions. The network must have reasonably low network jitter, network delay, and packet loss rate.

Methods Supported

The ATA 187 supports these methods. For more information, see RFC3261 (SIP: Session Initiation Protocol).

•REGISTER

•REFER

•INVITE

•BYE

•CANCEL

•NOTIFY

•OPTIONS

•ACK

•SUBSCRIBE

Cisco ATA 187 Analog Telephone Adaptor Administration Guide for SIP (Version 1.0)

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