Cisco WRP400-G1 Administration Guide - Page 32

SIP Proxy Redundancy, Configuring Voice Services, Audio Configuration

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Configuring Voice Services ATA Software Features 3 • G.726-32 This low complexity codec supports compressed 16, 24, 32, and 40 kbps digitized voice transmission at one through ten 10 ms voice frames per packet. This codec provides high voice quality. • G.729a The ITU G.729 voice coding algorithm is used to compress digitized speech. G.729a is a reduced complexity version of G.729. It requires about half the processing power as compared to G.729. The G.729 and G.729a bit streams are compatible and interoperable, but not identical. The administrator can select the preferred codecs to be used for each line. See "Audio Configuration section," on page 104. In addition, negotiation of the optimal voice codec sometimes depends on the ability of an ATA to match a codec name with the codec used by the far-end device. You can individually name the various codecs so that the WRP400 can successfully negotiate the codec with the far-end equipment. For more information, see Audio Configuration section, page 104. SIP Proxy Redundancy In typical commercial IP Telephony deployments, all calls are established through a SIP proxy server. An average SIP proxy server may 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 WRP400 supports the use of backup SIP proxy servers (via DNS SRV) so that service disruption should be nearly eliminated. A relatively simple way to support proxy redundancy is to configure your DNS server with a list of SIP proxy addresses. The WRP400 can be instructed to contact a SIP proxy server in a domain named in the SIP message. The WRP400 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 WRP400 tries to contact the list of hosts in the order of their stated priority. If the WRP400 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 pages in the Configuration Utility. See Appendix B, "Data Fields.". Cisco Small Business WRP400 Administration Guide 30

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Configuring Voice Services
ATA Software Features
Cisco Small Business WRP400 Administration Guide
30
3
•
G.726-32
This low complexity codec supports compressed 16, 24, 32, and 40 kbps
digitized voice transmission at one through ten 10 ms voice frames per packet.
This codec provides high voice quality.
•
G.729a
The ITU G.729 voice coding algorithm is used to compress digitized speech.
G.729a is a reduced complexity version of G.729. It requires about half the
processing power as compared to G.729. The G.729 and G.729a bit streams
are compatible and interoperable, but not identical.
The administrator can select the preferred codecs to be used for each line. See
“Audio Configuration section,” on page 104
.
In addition, negotiation of the optimal voice codec sometimes depends on the
ability of an ATA to match a codec name with the codec used by the far-end
device. You can individually name the various codecs so that the WRP400 can
successfully negotiate the codec with the far-end equipment. For more
information, see
Audio Configuration section, page 104
.
SIP Proxy Redundancy
In typical commercial IP Telephony deployments, all calls are established through
a SIP proxy server. An average SIP proxy server may 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 WRP400 supports
the use of backup SIP proxy servers (via DNS SRV) so that service disruption
should be nearly eliminated.
A relatively simple way to support proxy redundancy is to configure your DNS
server with a list of SIP proxy addresses. The WRP400 can be instructed to
contact a SIP proxy server in a domain named in the SIP message. The WRP400
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 WRP400 tries to contact the list of hosts in the order of their
stated priority.
If the WRP400 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 pages in the Configuration Utility. See
Appendix B, “Data Fields.”
.