CHAPTER72 Configuration Parameters Reference
Mediant 800 Gateway & E-SBC | User's Manual
Parameter Description
'Enable Network ISDN
Transfer'
configure voip >
sip-definition
settings > network-
isdn-xfer
[EnableNetworkISDNTran
sfer]
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).
[DisableFallbackTransferT
oTDM]
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.
gateway digital
settings > isdn-
ignore-18x-without-
sdp
[ISDNIgnore18xWithoutSD
P]
Enables interworking SIP 18x without SDP and ISDN Q.931
Progress/Alerting messages.
■ [0] = Disable. Incoming SIP 18x messages without SDP are
replied by the device by PRACK (if required), but the device
doesn't interwork these SIP messages with Q.931 Progress
or Alerting messages (i.e., doesn't send to PSTN).
■ [1] = (Default) Enable. The device interworks 18x SIP
messages with Q.931 Progress and Alerting messages (if
required) and sends them to the PSTN.
gateway digital
settings > isdn-
send-progress-for-
te
[ISDNSendProgressForT
E]
Defines whether the device sends Q.931 Progress messages to
the ISDN trunk if the trunk is configured as User side (TE)
and/or Network (NT) side, for IP-to-Tel calls.
■ [0] = Disable. The device sends Progress messages to the
trunk only if the trunk is configured as NT.
■ [1] = (Default) Enable. The device sends Q.931 Progress
messages to the trunk if the trunk is configured as TE or NT.
Note: To configure the trunk's ISDN termination side (TE or
NT), use the 'ISDN Termination Side' parameter.
'Enable QSIG Transfer
Update'
qsig-xfer-update
[EnableQSIGTransferUpda
te]
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.
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