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Getting Started
Feature Overview
Cisco SPA100 Series Administration Guide 3
1
SIP Proxy Redundancy
In typical commercial IP Telephony deployments, all calls are established through a SIP proxy
server. A typical SIP proxy server can handle thousands of subscribers. It is important that a
backup server be available so that an active server can be temporarily switched out for
maintenance. The ATA supports the use of backup SIP proxy servers (through DNS SRV) so
that service disruption is minimized.
An easy way to support proxy redundancy is to configure your DNS server with a list of SIP
proxy addresses. The ATA can be instructed to contact a SIP proxy server in a domain named
in the SIP message. The ATA consults the DNS server to get a list of hosts in the given domain
that provide 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 tries to contact the list of hosts in the order of their stated priority.
If the ATA is currently using a lower priority proxy server, it periodically probes the higher
priority proxy to see whether it is online, and switches back to the higher priority proxy when
possible. You can use the default settings or configure the Proxy Redundancy Method in the
Proxy and Registration section of the Line 1 and Line 2 Settings (PHONE 1 and PHONE 2),
page 80 page
Other ATA Voice Features
Silence Suppression and Comfort Noise Generation
Voice Activity Detection (VAD) with Silence Suppression is a means of increasing the
number of calls supported by the network by reducing the average bandwidth required
for a single call. VAD distinguishes between speech and non-speech signals, and
Silence Suppression removes the natural silences that occur in a conversation.
Therefore the IP bandwidth is used only to transmit speech. Comfort Noise Generation
provides artificially-generated background white noise (sounds) to reassure callers that
their calls are still connected during the silent periods. You can enable this feature in
the Audio Configuration section of the Line 1 and Line 2 Settings (PHONE 1 and
PHONE 2) page.
G.729a ITU G.729 voice coding algorithm used to compress
digitized speech. G.729a is a reduced complexity version of
G.729 requiring about half the processing power of G.729.
The G.729 and G.729a bit streams are compatible and
interoperable, but not identical.
Codec Description
3


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