Cisco Systems ATA 186 manual MGCP Endpoint Device Type, Cisco ATA Registration Process with MGCP

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)

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