AudioCodes Mediant 800B - Page 1249

Version 7.2 1249 Mediant 800B Gateway & E-SBC
User's Manual 72. Configuration Parameters Reference
Parameter Description
before the transfer is initiated.
 [0] Alert = (Default) Enables ISDN Transfer if the outg
oing call is in
Alerting or Connect state.
 [1] Connect = Enables ISDN Transfer only if the outgoing call is in
Connect state.
Note: For RLT ISDN transfer (TrunkTransferMode = 2 and
ProtocolType = 14 DMS-100), the parameter must be set to 1.
configure voip > gateway
dtmf-supp-service supp-
service-settings > isdn-xfer-
complete-timeout
[ISDNTransferCompleteTime
out]
Defines the timeout (in seconds) for determining ISDN call transfer
(ECT, RLT, or TBCT) failure. If the device does not receive any
response to an ISDN transfer attempt within this user-defined time,
the device identifies this as an ISDN transfer failure and subsequently
performs a hairpin TDM connection or sends a SIP NOTIFY message
with a SIP 603 response (depending whether hairpin is enabled or
disabled, using the parameter DisableFallbackTransferToTDM).
The valid range is 1 to 10. The default is 4.
Enable Network ISDN
Transfer
configure voip > sip-definition
settings > network-isdn-xfer
[EnableNetworkISDNTransfer
]
Determines whether the device allows interworking of network-side
received ECT/TBCT Facility messages (NI-2 TBCT - Two B-channel
Transfer and ETSI ECT - Explicit Call Transfer) to SIP REFER.
 [0] Disable = Rejects ISDN transfer requests.
 [1] Enable = (Default) The device sends a SIP REFER message
to the remote call party if ECT/TBCT Facility messages are
received from the ISDN side (e.g., from a PBX).
[DisableFallbackTransferToT
DM]
Enables "hairpin" TDM transfer upon ISDN (ECT, RLT, or TBCT) call
transfer failure. When this feature is enabled and an ISDN call
transfer failure occurs, the device sends a SIP NOTIFY message with
a SIP 603 Decline response.
 [0] = (Default) The device performs a hairpin TDM transfer upon
ISDN call transfer.
 [1] = Hairpin TDM transfer is disabled.
Enable QSIG Transfer
Update
qsig-xfer-update
[EnableQSIGTransferUpdate]
Determines whether the device interworks QSIG Facility messages
with CallTranferComplete or CallTransferUpdate invoke application
protocol data units (APDU) to SIP UPDATE messages with P-
Asserted-Identity and optional Privacy headers. This feature is
supported for IP-to-Tel and Tel-to-IP calls.
 [0] Disable = (Default) Ignores QSIG Facility messages with
CallTranferComplete or CallTransferUpdate invokes.
 [1] Enable
For example, assume A and C are PBX call parties and B is the SIP
IP phone:
1 A calls B; B answers the call.
2 A places B on hold and calls C; C answers the call.
3 A performs a call transfer (the transfer is done internally by the
PBX); B and C are connected to one another.
In the above example, the PBX updates B that it is now talking with
C. The PBX updates this by sending a QSIG Facility message with
CallTranferComplete invoke APDU. The device interworks this
message to a SIP UPDATE message containing a P-Asserted-
Identity header with the number and name derived from the QSIG
CallTranferComplete RedirectionNumber and RedirectionName.