Cisco ATA 180 Series Analog Telephone Adaptors

Cisco ATA 187 Analog Telephone Adaptor

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Product Overview

The Cisco ® ATA 187 Analog Telephone Adaptor is a handset-to-Ethernet adaptor that turns traditional telephone devices into IP devices. Customers can take advantage of the many new and exciting IP telephony applications by connecting their analog devices to Cisco ATAs.
The Cisco ATA products are standards-based communication devices that deliver true, next-generation voice-over-IP (VoIP) terminations to businesses and residences worldwide.

• Protects existing telephone investment: The Cisco ATA 187 supports two voice ports, each with its own independent telephone number, and a single RJ-45 10/100 BASE-T Ethernet port. This adaptor can make use of existing Ethernet LANs in addition to broadband pipes such as DSL, fixed wireless, and cable modem deployments.

• Cost effective: The Cisco ATA 187 helps customers turn their analog phone devices into IP devices cost effectively and is the preferred solution to address the needs of customers who connect to enterprise networks, small-office environments, or the emerging VoIP managed voice services and local services market.

Enterprise customers are using the Cisco ATA 187 to connect analog phones and fax machines to their VoIP network. Service providers are taking advantage of emerging telephony applications and the ease of deploying second-line services using the Cisco ATA 187 (Figures 1 and 2).

Figure 1. Cisco ATA 187: Endpoint for an End-to-End Broadband System

Figure 2. Cisco ATA 187 as Endpoint in Session Initiation Protocol (SIP) Network

* DSL and cable mode need SIP support.

Features and Benefits

Table 1 lists the features and benefits of the Cisco ATA 187.

Table 1. Features and Benefits



Configuration and Provisioning

• Configuration as per Cisco endpoints devices
• Autoprovisioning with Trivial File Transfer Protocol (TFTP) for servers
• Automatic assignment of IP address, network routing IP, and subnet mask using Dynamic Host Configuration Protocol (DHCP)
• Touch-tone telephone keypad configuration with voice prompt
• Administration password to protect configuration and access
• Remote upgrades through network
• Cisco Unified Communications Manager (UCM) standard configuration and provisioning options
• Ease of administration

Voice Quality

• Advanced preprocessing to optimize full-duplex voice compression
• High-performance line-echo cancellation to eliminate noise and echo
• Voice activity detection (VAD) and comfort noise generation (CNG) to save bandwidth by delivering voice, not silence
• Dynamic network monitoring to reduce jitter artifacts such a packet loss

Clear, natural-sounding voice quality

Signaling Protocol

• Session Initiation Protocol (SIP) on the Cisco line side

Allows interoperation with Cisco UCM SIP solution


• Secure Real-Time Transfer Protocol and Transport Layer Security (SRTP/TLS) over SIP

Secure media and secure signaling support, for secure solutions

Fax Support

• T38 fax support

Standard fax capability to send faxes over the IP network

Form Factor

• Fits in most environments

New form-factor design based on the Cisco endpoints portfolio

Cisco UCM Version Compatibility

• Cisco UCM Versions 7.1.5, 8.0.2, or higher

Product Specifications

Table 2 presents the specifications for the Cisco ATA 187.

Table 2. Product Specifications

Physical Specifications


Power supply: Universal AC power supply 100 and 240V

Power adaptor output voltage: +12.0 VDC at 1A maximum

Noise level

Less than 34 dBA at 3 feet


2 RJ 11


Operating temperature: 23 to 113°F (5 to 45 °C)

Non-operating temperature: -13 to 158ºF (-25 to 70ºC)


Operating humidity: 5 to 95% noncondensing

Mean time between failure (MTBF)

100,000 hours

Physical dimensions

(H x W x D) and weight

Dimensions: 1.5 x 5.4 x 6.7 in. (3.8 x 13.7 x 17.0 cm)

Weight: 9.2 oz (260g)


RoHS- and WEEE-compliant materials

On-off switch

To turn device on and off

Software Specifications

Cisco ATA SIP services

• IP address assignment: Provided by DHCP or statically configured
• Cisco ATA configuration through Cisco UCM configuration interface
• VLAN configuration
• Cisco Discovery Protocol
• Low-bit-rate codec selection
• User authentication
• Configurable tones (dial tone, busy tone, alert tone, reorder tone, and call-waiting tone)
• Dial plans
• SIP proxy server redundancy
• Privacy features
• Domain Name System (DNS) service (SRV) support
• User-configurable, call waiting; permanent default setting
• Comfort noise during silence period when using G.711
• Advanced audio mode
• Caller ID format
• Ring cadence format
• Silence suppression
• Hook-flash detection timing configuration
• Configurable on-hook delay
• Type of service (ToS) configuration for audio and signaling Ethernet packets
• Debugging and diagnostic tools

SIP services

Cisco ATA supports the methods listed here (for more information, refer to RFC-3261):


Supplementary services

• Caller ID
• Call-waiting caller ID
• Voice-mail indication
• Conference call
• Call waiting
• Call forwarding
• Calling-line identification
• Unattended transfer
• Attended transfer
• Shared line
• Speed dial
• Meet me
• Pick up
• Redial

Other supported protocols

• IEEE 802.1Q VLAN tagging
• Cisco Discovery Protocol
• Internet Control Message Protocol (ICMP)
• IP
• Real-Time Transport Protocol (RTP)
• Trivial File Transfer Protocol (TFTP)
• User Datagram Protocol (UDP)

Fax services

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

• Fax pass-through mode: The mode enables receiver-side called-station-identification (CED) tone detection with automatic G.711A-law or G.711μ-law switching.
• T38 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 the fax modem response to these conditions. The network must have reasonably low network jitter, network delay, and packet loss rate.

Voice codecs supported

• G.711μ-law
• G.711A-law
• G.729
• G.729A
• G.729B
• G.729AB


• SRTP secures voice conversations on the network and provides protection against replay attacks.
• TLS is a cryptographic protocol that secures data communications such as email on the Internet. TLS is functionally equivalent to SSL.

VoIP specifications

• LAN port: One RJ-45 10/100BASE-T Fast Ethernet port
• Quality of service (QoS): Precedence setting and differentiated services code point (DSCP)

Call progress tones

Configurable based on network locale

Line-echo cancellation

• Echo canceller for each port
• 8-millisecond (ms) echo length
• Nonlinear echo suppression (echo return loss [ERL] greater than 28 dB for f = 300 to 3400 Hz)

System Requirements

Figure 3 shows the system setup.

Figure 3. System Setup

Warranty Information

Find warranty information on at the Product Warranties page.

Ordering Information

Help customers understand all the components or parts they need to purchase to install and use the product. This section also provides a direct link to the Cisco Ordering Tool, and Table 3 lists part numbers for customer convenience.
To place an order, visit the Cisco Ordering homepage. To download software, visit the Cisco Software Center.

Table 3. Ordering Information

Product Name

Part Number

Cisco ATA 187


Product Name

Part Number

ATA power supply cables for Taiwan


ATA power supply cables for Brazil


ATA power supply cables for North America


ATA power supply cables for Japan


ATA power supply cables for Continent Europe


ATA power supply cables for United Kingdom


ATA power supply cables for Australia


ATA power supply cables for China


ATA power supply cables for Argentina


ATA power supply cables for India


ATA power supply cables for Mexico


ATA power supply cables for Saudi Arabia


ATA power supply cable for South Africa


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