AudioCodes Mediant 500 MSBR, Руководство пользователя

Страница: 1164 / 1248

User's Manual 1164 Document #: LTRT-10375
Mediant 500 MSBR
executing a CAS Wink, waits for an acknowledged Wink from the
remote side, dials the Refer-to number to the switch, and then
releases the call.
Note: A specific NFA CAS table is required.

[2] = Supports ISDN PRI/BRI transfer - Release Link Trunk (RLT)
(DMS-100), Two B Channel Transfer (TBCT) (NI2), Explicit Call
Transfer (ECT) (EURO ISDN), and Path Replacement (QSIG). When
a SIP REFER message is received, the device performs a transfer
by sending Facility messages to the PBX with the necessary
information on the call's legs to be connected. The different ISDN
variants use slightly different methods (using Facility messages) to
perform the transfer.
Note:

For RLT ISDN transfer, the parameter
SendISDNTransferOnConnect must be set to 1.

The parameter SendISDNTransferOnConnect can be used to
define if the TBCT/ECT transfer is performed after receipt of
Alerting or Connect messages. For RLT, the transfer is always
done after receipt of Connect (SendISDNTransferOnConnect is
set to 1).

This transfer can be performed between B-channels from
different trunks or Trunk Groups, by using the parameter
EnableTransferAcrossTrunkGroups.

The device initiates the ECT process after receiving a SIP
REFER message only for trunks that are configured to User
side.

[3] = Supports CAS Normal transfer. When a SIP REFER message
is received, the device performs a Blind Transfer by executing a CAS
Wink, dialing the Refer-to number to the switch, and then releasing
the call.

[4] = Supports QSIG Single Step transfer PRI/BRI:

IP-to-Tel: When a SIP REFER message is received, the device
performs a transfer by sending a Facility message to the PBX,
initiating Single Step transfer. Once a success return result is
received, the transfer is completed.

Tel-to-IP: When a Facility message initiating Single Step transfer
is received from the PBX, a SIP REFER message is sent to the
IP side.

[5] = IP-to-Tel Blind Transfer mode supported for ISDN PRI/BRI
protocols and implemented according to AT&T Toll Free Transfer
Connect Service (TR 50075) “Courtesy Transfer-Human-No Data”.
When the device receives a SIP REFER message, it performs a
blind transfer by first dialing the DTMF digits (transfer prefix) defined
by the parameter XferPrefixIP2Tel (configured to "*8" for AT&T
service), and then (after 500 msec) the device dials the DTMF of the
number (referred) from the Refer-To header sip:URI userpart.
If the hostpart of the Refer-To sip:URI contains the device's IP
address, and if the Trunk Group selected according to the IP to Tel
Routing table is the same Trunk Group as the original call, then the
device performs the in-band DTMF transfer; otherwise, the device
sends the INVITE according to regular transfer rules.
After completing the in-band transfer, the device waits for the ISDN
Disconnect message. If the Disconnect message is received during
the first 5 seconds, the device sends a SIP NOTIFY with 200 OK
message; otherwise, the device sends a NOTIFY with 4xx message.

[6] = Supports AT&T toll free out-of-band blind transfer for trunks
configured with the 4ESS ISDN protocol. AT&T courtesy transfer is a