Chapter 4 Cisco ATA-Supported MGCP Services

Additional MGCP Services

MGCP Endpoint Device Type

To request the device type from the Cisco ATA, the Call Agent must use the following syntax in the RequestedInfo (F:) parameter line of an AUEP command:

F: X-UA

The Cisco ATA responds with the following device-type:

X-UA: Cisco/ATA186

Call Agent Redundancy with Configuration Parameters

Call Agent (CA) redundancy is supported in two ways. You can use the following sets of parameters to configure the primary and secondary CA IP addresses or URLs:

•CA0orCM0, page 5-12, and CA0UID, page 5-13

•CA1orCM1, page 5-13, and CA1UID, page 5-14

If the CA is identified with the format CallAgentName@HostName, enter the CA name in the CAxUID parameter and enter the HostName in the CAxorCMx parameter (x is 0 or 1).

If the CA is identified using a URL, enter the URL in the CAxorCMx parameter. An optional port number can also be entered in the format CAxorCMx:Port# (x is 0 or 1).

When the Cisco ATA power ups or performs a configuration update, it tries to contact the primary CA at CA0orCM0. If there is no response or the address is not reachable, the Cisco ATA then tries to contact the secondary CA. The Cisco ATA continues to alternate attempts to contact the primary and secondary CAs until it gets a response.

If the CAxorCMx parameter is configured with a URL, the Cisco ATA contacts the DNS server to resolve the name. The Cisco ATA accepts up to four IP addresses from the DNS server. During operation, if contact is lost between the Cisco ATA and its CA, the Cisco ATA uses an exponential timeout period on each attempt to reach the CA at the IP addresses. The Cisco ATA cycles through the IP addresses until it gets a response.

Cisco ATA Registration Process with MGCP

When the Cisco ATA powers up, each MGCP endpoint is in a disconnected state. The Cisco ATA sends a Restart in Progress (RSIP) command for each MGCP endpoint to the preconfigured Call Agent using one of the following syntax definitions, selected by using Bit 24 in the ConnectMode parameter (see the “ConnectMode” section on page 5-24):

Syntax Type 1

RSIP EPID0@ip_address MGCPVersion

RM: restart

and

RSIP EPID1@ip_address MGCPVersion

RM: restart

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide for MGCP (version 3.0)

4-4

OL-4803-01

 

 

Page 63 Page 65
Page 64
Image 64
Cisco Systems ATA 186 manual Mgcp Endpoint Device Type, Call Agent Redundancy with Configuration Parameters, Syntax Type
Page 63 Page 65

ATA 186 specifications

The Cisco Systems ATA 186, or Analog Telephone Adapter, revolutionized the way traditional telephony interacted with Voice over Internet Protocol (VoIP) systems. Designed primarily for home and small office use, the ATA 186 allows users to connect standard analog phones and fax machines to a network, enabling them to take advantage of the benefits of VoIP technology.

One of the defining features of the ATA 186 is its dual port architecture. It includes two FXS ports, allowing users to connect up to two analog telephones. This functionality means that multiple devices can leverage VoIP services simultaneously without the need for separate adapters for each phone. The flexibility of the ATA 186 helps streamline the user experience, facilitating voice communication over an IP network while ensuring users can still use their existing phone equipment.

The ATA 186 employs various technologies to maintain high-quality voice calls. It supports standard voice codecs such as G.711 and G.729, which ensure efficient bandwidth usage while preserving call clarity. The adaptive jitter buffer technology further enhances call quality, compensating for network variations and minimizing latency, which is crucial for clear and uninterrupted conversations.

Additionally, the ATA 186 provides users with advanced calling features that were traditionally available only on PBX systems. These features include caller ID, call waiting, and voicemail functionality, integrating seamlessly with typical telephony services. The device also supports T.38 fax relay, allowing users to send and receive faxes over the internet, thus addressing the needs of environments where fax communication remains essential.

The security of VoIP conversations is also a priority for the ATA 186. It employs encryption protocols such as Secure Real-time Transport Protocol (SRTP) and Transport Layer Security (TLS), ensuring that voice data is securely transmitted across the network. This focus on security helps protect sensitive information transmitted during calls.

Installation and configuration of the ATA 186 is streamlined, with an intuitive web-based interface that simplifies the setup process. This accessibility makes it suitable for users with varying levels of technical expertise, as frequently required adjustments, such as network configurations and firmware updates, can be easily managed.

In conclusion, the Cisco Systems ATA 186 stands out as a versatile and robust solution for users looking to integrate analog phones into a VoIP environment. With its dual port capabilities, high-quality voice codecs, advanced call features, and security measures, it offers a compelling choice for both residential and commercial users seeking seamless telephony integration. As technology evolves, devices like the ATA 186 remain cornerstones in bridging traditional telephony with modern communication systems.
Top Page Image Contents