Version 6.6 649 Mediant 2000
User's Manual 45. Configuration Parameters Reference
Parameter Description
from the ISDN side (e.g., from a PBX).
[DisableFallbackTransf
erToTDM]
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.
Web: Enable QSIG
Transfer Update
[EnableQSIGTransferU
pdate]
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.
Notes:
 For IP-to-Tel calls, the RedirectionNumber and RedirectionName in
the CallTRansferComplete invoke is derived from the P-Asserted-
Identity and Privacy headers in the received SIP INFO message.
 To include the P-Asserted-Identity header in outgoing SIP UPDATE
messages, set the AssertedIDMode parameter to Add P-Asserted-
Identity.
EMS: CAS Detection Of
Hook Flash
[CASSendHookFlash]
Enables sending Wink signal toward CAS trunks.
 [0] = Disable (default)
 [1] = Enable
If the device receives a mid-call SIP INFO message with flashhook
event body (as shown below) and this parameter is set to 1, the device
generates a wink signal toward the CAS trunk. The CAS wink signal is
done by changing the A bit from 1 to 0, and then back to 1 for 450
msec.
INFO sip:4505656002@192.168.13.40:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.13.2:5060
From: <sip:06@192.168.13.2:5060>
To:
<sip:4505656002@192.168.13.40:5060>;tag=132878796-
1040067870294
Call-ID: 0010-0016-D69A7DA8-1@192.168.13.2
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