User's Manual 444 Document #: LTRT-27055
Mediant 1000B Gateway & E-SBC
Parameter Description
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-resultant
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 special 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.
[2] IP Group Name = Sets the host
part in the REFER message to
the name defined 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 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.
[5] Keep Host = The device forwards the REFER message
without changing the host part in the SIP Refer-To header. This
applies to all types of call transfers (e.g., blind and attendant
transfer).
Note: The corresponding global parameter is SBCReferBehavior.
Remote Replaces Mode
sbc-rmt-replaces-behavior
[IpProfile_SBCRemoteReplac
esBehavior]
Enables the device to handle incoming INVITEs containing the
Replaces header for the SIP entity (which does not support the
header) associated with the IP Profile. The Replaces header is used
to replace an existing SIP dialog with a new dialog such as in call
transfer or call pickup.
[0] Standard = (Default) The SIP entity supports INVITE
messages containing Replaces headers. The device forwards the
INVITE message containing the Replaces header to the SIP
entity. The device may change the value of the Replaces header
to reflect the call identifiers of the leg.
[1] Handle Locally = The SIP entity does not support INVITE
messages containing Replaces headers. The device terminates
the received INVITE containing the Replaces header and
establishes a new call between the SIP entity and the new call
party. It then disconnects the call with the initial call party, by
sending it a SIP BYE request.
[2] Keep as is = The SIP entity supports INVITE messages
containing Replaces headers. The device forwards the Replaces
header as is in incoming REFER and outgoing INVITE messages
from/to the SIP entity (i.e., Replaces header's value is
unchanged).
For example, assume that the device establishes a call between A
and B. If B initiates a call transfer to C, the device receives an
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