Version 6.4 385 March 2012
SIP User's Manual 19. Stand-Alone Survivability (SAS) Application
19.1.1.2.3 Exiting Emergency and Returning to Normal State
Once the connection with the primary proxy is re-established, the following occurs:
UAs: switch back to operate with the primary proxy.
SAS: ignores REGISTER requests from the UAs, forcing the UAs to switch back to
the primary proxy.
Note: This is applicable only if the 'SAS Survivability Mode' parameter is set to
'Always Emergency' (2).
19.1.2 SAS Routing
This section provides flowcharts describing the routing logic for SAS in normal and
emergency states.
19.1.2.1 SAS Routing in Normal State
The flowchart below displays the routing logic for SAS in normal state for INVITE
messages received from the UAs:
Figure 19-5: Flowchart of INVITE from UA's in SAS Normal State
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