Secure Real-Time Transport Protocol; Fax Passthrough; Transport Layer Security Protocol; Fax Relay - Cisco ATA 191 Administration Manual

Analog telephone adapter
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Software Features
Transport Layer Security Protocol, on page 8
T.38 Fax Relay, on page 8
Supported Voice Codecs, on page 8
Other Supported Protocols, on page 9
Supported SIP Services, on page 9
Modem Standards, on page 10
Fax Services, on page 11
Supported Methods, on page 11
Supported ATA Call Features, on page 12

Secure Real-Time Transport Protocol

Secure Real-Time Transport Protocol secures voice conversations on the network and provides protection
against replay attacks.

Fax Passthrough

Name Signaling Event (NSE) -based and re-INVITE-based passthrough provide transport of fax communications
using the G.711a/u codec.

Transport Layer Security Protocol

Transport Layer Security (TLS) is a cryptographic protocol that secures data communications such as email
on the Internet. TLS is functionally equivalent to Secure Sockets Layer (SSL).
T.38 Fax Relay
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, then sent to the T.38 fax device. When the target T.38 fax
device receives this image, the device converts the image 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. With the SIP call control protocol, the Session Description Protocol (SDP) entries in the initial SIP
INVITE message indicate that T.38 fax relay is present. After the initial SIP INVITE message, the call is
established to switch from voice mode to T.38 mode. Cisco Unified Communications Administration allows
you to configure a SIP profile that supports T.38 fax communication.
The ATA 191 only supports T38 Fax Relay Version 0 (G3).

Supported Voice Codecs

The ATA 191 supports these voice codecs:
• G.711 mu-law
• G.711 A-law
Cisco ATA 191 Analog Telephone Adapter Administration Guide for Cisco Unified Communications Manager
8
Cisco ATA 191 Analog Telephone Adapter Overview

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