Version 6.4 391 March 2012
SIP User's Manual 19. Stand-Alone Survivability (SAS) Application
d. From the 'Enable Proxy Keep Alive' drop-down list, select Using Options. This
instructs the device to send SIP OPTIONS messages to the proxy for the keep-
alive mechanism.
Figure 19-10: Defining UAs' Proxy Server
e. Click Submit to apply your settings.
19.2.2 Configuring SAS Outbound Mode
This section describes how to configure the SAS outbound mode. These settings are in
addition to the ones described in 'Configuring Common SAS Parameters' on page 388.
Note: The VoIP CPEs (such as IP phones or residential gateways) need to be
defined so that their proxy and registrar destination addresses and ports are
the same as that configured for the device's SAS IP address and SAS local
SIP port. In some cases, on the UAs, it is also required to define SAS as their
outbound proxy, meaning that messages sent by the UAs include the host
part of the external proxy, but are sent (on Layer 3/4) to the IP address / UDP
port of SAS.
To configure SAS outbound mode:
1. Open the SAS Configuration page (Configuration tab > VoIP menu > SAS > Stand
Alone Survivability).
2. From the 'SAS Survivability Mode' drop-down list, select Standard.
3. Click Submit.
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