Cisco ATA 191 Analog Telephone Adapter Overview
Port or Button
DC 5V POWER
Software Features
The ATA 191 supports these protocols, services, and methods:
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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
Secure Real-Time Transport Protocol, on page 7
Fax Passthrough, on page 7
Transport Layer Security Protocol, on page 7
T.38 Fax Relay, on page 7
Supported Voice Codecs, on page 8
Other Supported Protocols, on page 8
Supported SIP Services, on page 8
Modem Standards, on page 10
Fax Services, on page 10
Supported Methods, on page 11
Supported ATA Call Features, on page 11
Description
Use the provided power adapter to connect to a power source.
Cisco ATA 191 Analog Telephone Adapter Overview
Software Features
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