<alias>sip:rhughes@broadsoft.com</alias>
</aliases>
<extensions>
<extension>5317</extension>
<extension>1321</extension>
</extensions>
</BroadSoftDocument>
30.9.2 BroadSoft's Shared Phone Line Call Appearance for SBC
Survivability
The device can provide redundancy for BroadSoft's Shared Call Appearance feature.
When the BroadSoft application server switch (AS) fails or does not respond, or when the
network connection between the device and the BroadSoft AS is down, the device
manages the Shared Call Appearance feature for the SIP clients.
This feature is supported by configuring a primary extension and associating it with
secondary extensions (i.e., shared lines) so that incoming calls to the primary extension
also ring at the secondary extensions. The call is established with the first extension to
answer the call, and consequently, the ringing at the other extensions stop. For example,
assume primary extension number 600 is shared with secondary extensions 601 and 602.
In the case of an incoming call to 600, all three phone extensions ring simultaneously
(using the device's call forking feature as described in 'SIP Forking Initiated by SIP Proxy
Server' on page 454). Note that incoming calls specific to extensions 601 or 602 ring only
at these specific extensions.
Figure 30-10: Call Survivability for BroadSoft's Shared Line Appearance
To configure this capability, you need to configure a shared-line, inbound manipulation rule
for registration requests to change the destination number of the secondary extension
numbers (e.g. 601 and 602) to the primary extension (e.g., 600). Call forking must also be
enabled. The procedure below describes the main configuration required.
Notes:
• You can configure whether REGISTER messages from secondary lines
are terminated on the device or forwarded transparently (as is), using the
SBCSharedLineRegMode parameter.
• The device enables outgoing calls from all equipment that share the
same line simultaneously (usually only one simultaneous call is allowed
per a specific shared line).
• The LED indicator of a shared line may display the wrong current state.
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