Version 6.6 731 October 2014
Installation & Operation Manual 43. Session Border Controller (SBC) Application
Parameter
Name
Type
Provision
ing Type
Description
SBC 3xx
Behavior
Enum
Transparent,UseDB
Instant Determines the device's handling
of SIP 3xx responses. When
enabled, the device handles SIP
redirections between different
subnets (e.g., between LAN and
WAN sides). This is required
where the new address provided
by the redirector (Redirect sever)
may not be reachable by the far-
end user (FEU) that is located in
another subnet. For example, a
far-end user (FEU) in the WAN
sends a SIP request via the
device to a Redirect server in the
LAN, and the Redirect server
replies with a SIP 3xx response to
a PBX in the LAN in the Contact
header. If the device sends this
response as is (i.e., with the
original Contact header), the FEU
is unable to reach the new
destination.
[0] (default) = The device
sends the received SIP 3xx
response without changing the
Contact header (transparent
handling).
[1] = The device changes the
URI in the Contact header of
the received SIP 3xx response
to its own URI and adds a
special user prefix ("T~&R_"),
which is then sent to the FEU.
The FEU then sends a new
INVITE to the device, which
the device then sends to the
correct destination.
Notes:
When this parameter is changed
from 1 to 0, new 3xx Contact
headers remain unchanged.
However, requests with the
special prefix continue using the
device's database to locate the
new destination.
Only one database entry is
supported for the same host, port,
and transport combination. For
example, the following URLs
cannot be distinguished by the
device:
sip:10.10.10.10:5060;transport=tc
p;param=a
sip:10 10 10 10:5060;transport=tc
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