Sas Outbound Mode - AudioCodes Mediant 800 MSBG User Manual

SIP User's Manual
8.5.1.1

SAS Outbound Mode

This section describes the SAS outbound mode, which includes the following states:
Normal state (see ''Normal State'' on page 583)
Emergency state (see ''Emergency State'' on page 584)
8.5.1.1.1 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 8-99: SAS Outbound Mode in Normal State (Example)
Version 6.2 583
8. IP Telephony Capabilities
February 2011