SIP User's Manual 602 Document #: LTRT-12804
Mediant 800 MSBG
8.5.3.5.4 Blocking Calls from Unregistered SAS Users
To prevent malicious calls (for example, Service Theft), it is recommended to configure the
feature for blocking SIP INVITE messages received from SAS users that are not registered
in the SAS database. This applies to SAS in normal and emergency states.
¾ To block calls from unregistered SAS users:
1. Open the 'SAS Configuration' page (Configuration tab > VoIP menu > SAS Stand
Alone Survivability).
2. From the 'SAS Block Unregistered Users' drop-down list, select 'Block'.
Figure 8-117: Blocking Unregistered SAS Users
8.5.3.5.5 Configuring SAS Emergency Calls
You can configure SAS to route emergency calls (such as 911 in North America) directly to
the PSTN (through its FXO interface or E1/T1 trunk). Therefore, even during a
communication failure with the external proxy, enterprise UAs can still make emergency
calls.
You can define up to four emergency numbers, where each number can include up to four
digits. When SAS receives a SIP INVITE (from a UA) that includes one of the user-defined
emergency numbers in the SIP user part, it forwards the INVITE directly to the default
gateway (see ''SAS Routing in Emergency State'' on page 589).
The default gateway is
defined in the 'SAS Default Gateway IP' field, and this is the device itself. The device then
sends the call directly to the PSTN.
This feature is applicable to SAS in normal and emergency states.
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