SIP User's Manual 120 Document #: LTRT-65412
MP-11x & MP-124
3.3.4.6 SAS Parameters
The SAS submenu allows you to configure the SAS application. This submenu includes the
Stand Alone Survivability item page (refer to ''Configuring Stand-Alone Survivability
Parameters'' on page 120), from whi
ch you can also access the 'IP2IP Routing Table' page
for configuring SAS routing rules (refer to ''Configuring the IP2IP Routing Table (SAS)'' on
page 122).
Note: The SAS submenu appears only if the SAS application has been enabled
(refer to ''Enabling Applications'' on page 91).
3.3.4.6.1 Configuring Stand-Alone Survivability Parameters
The 'SAS Configuration' page allows you to configure the device's Stand-Alone Survivability
(SAS) feature. This feature is useful for providing a local backup through the PSTN in Small
or Medium Enterprises (SME) that are serviced by IP Centrex services. In such
environments, the enterprise's incoming and outgoing telephone calls (external and
internal) are controlled by the Proxy, which communicates with the enterprise through the
WAN interface. SAS ensures that incoming, outgoing, and internal calls service is
maintained in case of WAN or Proxy failure, using a PSTN (or an alternate VoIP) backup
connection and the device's built-in internal call routing. To utilize the SAS feature, the VoIP
CPEs such as IP phones or residential gateways need to be defined so that their Proxy and
Registrar destination addresses and UDP port equal the SAS feature's IP address and SAS
local SIP UDP port.
Notes:
• The 'SAS Configuration' page appears only if you have enabled the SAS
application (refer to ''Enabling Applications'' on page 91).
• For a detailed explanation on SAS, refer to ''Stand-Alone Survivability
(SAS) Feature'' on page 384.
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