AudioCodes Mediant 500 E-SBC, User Manual

Page: 818 / 920

User's Manual 818 Document #: LTRT-10437
Mediant 500 E-SBC
Parameter Description
[MLPPFlashOverOverRTPDSCP] Note: If set to -1, the DiffServ value is taken from the global
parameter PremiumServiceClassMediaDiffServ or as defined in
IP Profiles per call.
54.10.5.7 Call Cut-Through Parameters
The call cut-through parameters are described in the table below.
Table 54-47: Call Cut-Through Parameters
Parameter Description
CLI: cut-through-anable
[DigitalCutThrough] Enables PSTN CAS channels/endpoints to receive incoming IP calls even
if the B-channels are in off-hook state.

[0] Disabled (default)

[1] Enabled
When enabled, this feature operates as follows:
1
A Tel-to-IP call is established (connected) by the device for a B-
channel.
2
The device receives a SIP BYE (i.e., IP side ends the call) and plays a
reorder tone to the PSTN side for the duration set by the
CutThroughTimeForReOrderTone parameter. The device releases the
call towards the IP side (sends a SIP 200 OK).
3
The PSTN side, for whatever reason, remains off-hook.
4
If a new IP call is received for this B-channel after the reorder tone has
ended, the device “cuts through” the channel and connects the call
immediately (despite the B-channel being in physical off-hook state)
without playing a ring tone. If an IP call is received while the reorder
tone is played, the device rejects the call.
Notes:

If this parameter is disabled and the PSTN side remains in off-hook
state after the IP call ends the call, the device releases the call after 60
seconds.

A special CAS table can be used to report call status events
(Active/Idle) to the PSTN side during Cut Through mode.

This feature can also be configured in a Tel Profile and therefore,
assigned to specific B-channels that use specific CAS tables.