SIP User's Manual 290 Document #: LTRT-65415
MediaPack Series
c. In the 'Proxy Address' field, enter the IP address of the external proxy server.
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 8-39: Defining UAs' Proxy Server
e. Click Submit to apply your settings.
8.3.3.2 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 288.
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.
¾ 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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