Version 6.2 585 February 2011
SIP User's Manual 8. IP Telephony Capabilities
Note: In this SAS deployment, the UAs (e.g., IP phones) must support configuration
for primary and secondary proxy servers (i.e., proxy redundancy), as well as
homing. Homing allows the UAs to switch back to the primary server from the
secondary proxy once the connection to the primary server returns (UAs
check this using keep-alive messages to the primary server). If homing is not
supported by the UAs, you can configure SAS to ignore messages received
from UAs in normal state (the 'SAS Survivability Mode' parameter must be set
to 'Always Emergency' / 2) and thereby, “force” the UAs to switch back to their
primary proxy.
8.5.1.2.1 Normal State
In normal state, the UAs register and operate directly with the external proxy.
Figure 8-101: SAS Redundant Mode in Normal State (Example)
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