Introducing Cisco Small Business Analog Telephone Adapters
ATA Software Features
Cisco Small Business ATA Administration Guide 23
1
A relatively simple way to support proxy redundancy is to configure your DNS
server with a list of SIP proxy addresses. The ATA device can be instructed to
contact a SIP proxy server in a domain named in the SIP message. The ATA device
consults the DNS server to get a list of hosts in the given domain that provides SIP
services. If an entry exists, the DNS server returns an SRV record that contains a
list of SIP proxy servers for the domain, with their host names, priority, listening
ports, and so on. The ATA device tries to contact the list of hosts in the order of
their stated priority.
If the ATA device is currently using a lower priority proxy server, it periodically
probes the higher priority proxy to see whether it is back on line, and switches
back to the higher priority proxy when possible. SIP Proxy Redundancy is
configured in the Line and PSTN Line tabs in the Administration Web Server. See
ATA Routing Field Reference, on page 100.
Other ATA Software Features
The following table summarizes other features provided by ATA devices.
Feature Description
Streaming Audio
Server
See Configuring a Streaming Audio Server, on
page 83.
T.38 Fax Relay See Using a FAX Machine, on page 50.
Silence
Suppression
See Silence Suppression and Comfort Noise
Generation, on page 55.
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