AudioCodes Mediant 500 E-SBC, User Manual

Page: 327 / 920

User's Manual 19. Coders and Profiles
Version 6.8 327 Mediant 500 E-SBC
Parameter Description
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.

The 'Remote Early Media RTP Behavior parameter is set
to Delayed (used in the Lync environment), and transfer
target sends a 183 Session progress with SDP offer. If
early media from the transfer target has already been
detected, the transferee receives RTP stream from the
transfer target. If it has not been detected, the device
generates a ringback tone to the transferee and stops the
tone generation once RTP has been detected from the
transfer target.
For any of these scenarios, if the transferee is put on-hold by
the transferor, the device retrieves the transferee from hold,
sends a re-INVITE if necessary, and then plays the ringback
tone.
Note: For the device to play the ringback tone, it must be
loaded with a Prerecorded Tones (PRT) file. For more
information, see Prerecorded Tones File on page
555 .
Web: RTCP Mode
CLI: sbc-rtcp-mode
[IPProfile_SBCRTCPMode] Defines how the device handles RTCP packets during call
sessions for this SIP entity. This is useful for interworking
RTCP between SIP entities. For example, this may be
necessary when incoming RTCP is not compatible with the
destination SIP entity's (this IP Profile) RTCP support. In
such a scenario, the device can generate the RTCP and
send it to the SIP entity.

[0] Transparent (default) = RTCP is forwarded as is
(unless transcoding is done, in which case, the device
generates RTCP on both legs).

[1] Generate Always = Generates RTCP packets during
active and inactive (e.g., during call hold) RTP periods
(i.e., media is 'a=recvonly' or 'a=inactive' in the INVITE
SDP).

[2] Generate only if RTP Active = Generates RTCP
packets only during active RTP periods. In other words,
the device does not generate RTCP when there is no
RTP traffic (such as when a call is on hold).
Note: The corresponding global parameter is
SBCRTCPMode.