User's Manual 458 Document #: LTRT-10632
Mediant 800B Gateway & E-SBC
Parameter Description
[IpProfile_SBCUserBehindTc
pNATRegistrationTime]
The parameter applies only to users that are located behind NAT and
whose communication type is TCP. The registration time is inserted in
the Expires header in the outgoing response sent to the user.
The Expires header determines the lifespan of the registration. For
example, a value of 3600 means that the registration will timeout in
one hour, unless the user sends a refresh REGISTER before the
timeout. Upon timeout, the device removes the user’s details from the
registration database, and the user will not be able to make or receive
calls through the device.
The valid value is 0 to 2,000,000. If configured to 0, the Expires
header's value received in the user’s REGISTER request remains
unchanged. By default, no value is defined (-1).
Note: If the parameter is not configured, the registration time is
according to the global parameter SBCUserRegistrationTime or IP
Profile parameter IpProfile_SBCUserRegistrationTime.
SBC Forward and Transfer
Remote REFER Mode
sbc-rmt-refer-behavior
[IpProfile_SBCRemoteRefer
Behavior]
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.
[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-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).
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