CHAPTER19 Coders and Profiles
Mediant 4000 SBC | User's Manual
Parameter Description
'Remote REFER Mode'
sbc-rmt-refer-behavior
[IpProfile_
SBCRemoteReferBehavior]
Defines the device's handling of SIP REFER requests for
the IP entity (transferee - call party that is transfered to the
transfer target) associated with the IP Profile.
■ [0] Regular = (Default) SIP Refer-To header value is
unchanged and the device forwards the REFER
message as is. However, if you configure the 'Remote
Replaces Mode' parameter (see below) to any value
other than Keep as is, the device may modify the URI
of the Refer-To header to reflect the call identifiers of
the leg.
■ [1] Database URL = SIP Refer-To header value is
changed so that the re-routed INVITE is sent through
the device:
a. Before forwarding the REFER request, the device
changes the host part to the device's IP address
and adds a special prefix ("T~&R_") to the Contact
user part.
b. The incoming INVITE is identified as a REFER-res-
ultant INVITE according to this special prefix.
c. The device replaces the host part in the Request-
URI with the host from the REFER contact. The
special prefix remains in the user part for regular
classification, manipulation, and routing. The spe-
cial prefix can also be used for specific routing
rules for REFER-resultant INVITEs.
d. The special prefix is removed before the resultant
INVITE is sent to the destination ((transfer target).
■ [2] IP Group Name = Changes the host part in the
REFER message to the name configured for the IP
Group (in the IP Groups table).
■ [3] Handle Locally = Handles the incoming REFER
request itself without forwarding the REFER. The
device generates a new INVITE to the alternative
destination (transfer target) according to the rules in the
IP-to-IP Routing table (the 'Call Trigger' parameter
must be set to REFER).
■ [4] Local Host = In the REFER message received
from the transferor, the device replaces the Refer-To
header value (URL) with the IP address of the device or
with the ‘Local Host Name’ parameter value configured
for the IP Group (transferee) to where the device
forwards the REFER message. This ensures that the
transferee sends the re-routed INVITE back to the
device which then sends the call to the transfer target.
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