User's Manual
290
Document #: LTRT-65417
MP-11x & MP-124
26.1.1.1 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. SAS also 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
26-1: SAS Outbound Mode in Normal State (Example)
26.1.1.2 Emergency State
When a connection with the external proxy fails (detected by the device's keep-alive
messages), the device enters SAS emergency state. The device serves as a proxy for the
UAs, by handling internal call routing of the UAs (within the LAN enterprise).
When the device receives calls, it searches its SAS registration database to locate the
destination address (according to AOR or Contact). If the destination address is not found,
SAS forwards the call to the default gateway. Typically, the default gateway is defined as
the device itself (on which SAS is running), and if the device has PSTN interfaces, the
enterprise preserves its capability for outgoing calls (from UAs to the PSTN network).
The routing logic of SAS in emergency state is described in detail in 'SAS Routing in
Emergency State' on page
295
.
The figure below illustrates the operation of SAS outbound mode in emergency state:
Figure
26-2: SAS Outbound Mode in Emergency State (Example)
Summary of Contents for MediaPack MP-112
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Page 31: ...Part II Management Tools ...
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Page 103: ...Part IV General VoIP Configuration ...
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Page 319: ...Part VII Maintenance ...
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Page 347: ...Part VIII Status Performance Monitoring and Reporting ...
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Page 377: ...Part IX Diagnostics ...
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Page 403: ...Part X Appendix ...
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