CHAPTER19 Coders and Profiles
Mediant 800 Gateway & E-SBC | User's Manual
Parameter Description
■ [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 INVITE with the Replaces header from
C. If A supports the Replaces header, the device simply
forwards the INVITE as is to A; a new call is established
between A and C and the call between A and B is
disconnected. However, if A does not support the
Replaces header, the device uses this feature to terminate
the INVITE with Replaces header and handles the transfer
for A. The device does this by connecting A to C, and
disconnecting the call between A and B, by sending a SIP
BYE request to B. Note that if media transcoding is
required, the device sends an INVITE to C on behalf of A
with a new SDP offer.
'Play RBT To Transferee'
sbc-play-rbt-to-xferee
[IpProfile_
SBCPlayRBTToTransferee]
Enables the device to play a ringback tone to the
transferred party (transferee) during a blind call transfer, for
the SIP entity associated with the IP Profile (which does
not support such a tone generation during call transfer). The
ringback tone indicates to the transferee of the ringing of
the transfer target (to where the transferee is being
transferred).
■ [0] No (Default)
■ [1] Yes
Typically, the transferee hears a ringback tone only if the
transfer target sends it early media. However, if the
transferee is put on-hold before being transferred, no
ringback tone is heard.
When this feature is enabled, the device generates a
ringback tone to the transferee during call transfer in the
following scenarios:
■ Transfer target sends a SIP 180 (Ringing) to the device.
■ For non-blind transfer, if the call is transferred while the
transfer target is ringing and no early media occurs.
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