Cisco ATA 191 Quick Start Guide

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
• G.729a
• G.729ab
Check your other network devices for the codecs they support.
Other Supported Protocols
The ATA supports these additional protocols:
• 802.1Q VLAN tagging
• Cisco Discovery Protocol (CDP)
• Domain Name System (DNS)
• Dynamic Host Configuration Protocol (DHCP)
• Internet Control Message Protocol (ICMP)
• Internet Protocol (IP) v4 and IPv6
• Link Layer Discovery Protocol (LLDP)
• Secure Real-Time Transport Protocol (SRTP)
• Transmission Control Protocol (TCP)
• Trivial File Transfer Protocol (TFTP)
• User Datagram Protocol (UDP)
• Transport Layer Security (TLS)
• Secure Socket Shell (SSH)
• Network Time Protocol (NTP)
• HyperText Transfer Protocol (HTTP)
Supported SIP Services
The following SIP services are supported on the ATA:
• IP address assignment—DHCP-provided or statically configured
• ATA 191 configuration by Cisco Unified Communications Manager configuration interface
Cisco ATA 191 Analog Telephone Adapter Overview
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Cisco ATA 191 Analog Telephone Adapter Overview
Supported Voice Codecs

Cisco ATA 191 Specifications

General

Fax Support	T.38 Fax Relay
Relative Humidity	10% to 90% (non-condensing)
Ports	2 FXS ports
Voice Protocol	SIP
Protocols	SIP, RTP, RTCP
Power	5V DC
Network Interfaces	10/100BASE-T Ethernet port
Operating Temperature	32°F to 104°F (0°C to 40°C)
Audio Codecs	G.711 (a-law and μ-law), G.729a, G.722, G.726
Voice Codecs	G.711 (a-law and μ-law), G.729a, G.722, G.726
Storage Temperature	14 to 140°F (-10 to 60°C)