SIP User's Manual 280 Document #: LTRT-65415
MediaPack Series
8.3.1.1 SAS Outbound Mode
This section describes the SAS outbound mode, which includes the following states:
îš„ Normal state (see ''Normal State'' on page 280)
îš„ Emerge
ncy state (see ''Emergency State'' on page 281)
8.3.1.1.1 Normal State
In normal state, SAS receives REGISTER requests from the enterprise's UAs and forwards
them to the external proxy (i.e., outbound proxy). Once the proxy replies with a SIP 200
OK, the device records the Contact and address of record (AOR) of the UAs in its internal
SAS registration database. Therefore, in this mode, SAS maintains a database of all the
registered UAs in the network. In addition, SAS continuously maintains a keep-alive
mechanism toward the external proxy, using SIP OPTIONS messages. The figure below
illustrates the operation of SAS outbound mode in normal state:
Figure 8-30: SAS Outbound Mode in Normal State (Example)
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