Version 6.2
457
February 2011
SIP User's Manual
8. IP Telephony Capabilities
•
While hearing Ringback – transfer from alert.
•
While speaking to C - transfer from active.
The device also supports attended (consultation) call transfer for BRI phones (user side)
connected to the device and using the Euro ISDN protocol. BRI call transfer is according to
ETSI TS 183 036, Section G.2 (Explicit Communication Transfer – ECT). Call transfer is
enabled using the EnableTransfer and EnableHoldtoISDN parameters.
The Explicit Call Transfer (ECT, according to ETS-300-367, 368, 369) supplementary
service is supported for BRI and PRI trunks. This service provides the served user who has
two calls to ask the network to connect these two calls together and release its connection
to both parties. The two calls can be incoming or outgoing calls. This service is similar to
NI2 Two B-Channel Transfer (TBCT) Supplementary Service. The main difference is that in
ECT one of the calls must be in HELD state. The ECT standard defines two methods -
Implicit and Explicit. In implicit method, the two calls must be on the same trunk. BRI uses
the implicit mechanism, and PRI the explicit mechanism.
8.3.8.4.2 Blind Call Transfer
Blind call transfer is done (using SIP REFER messages) after a call is established between
call parties A and B, and party A decides to immediately transfer the call to C without
speaking to C. The result of the transfer is a call between B and C (similar to consultation
transfer, but skipping the consultation stage).
Note:
Currently, the device does not support blind transfer for BRI interfaces.
8.3.8.5 Call Forward
For digital interfaces: The device supports Call Deflection (ETS-300-207-1) for Euro ISDN
and QSIG (ETSI TS 102 393) for Network and User sides, which provides IP-ISDN
interworking of call forwarding (call diversion) when the device receives a SIP 302
response.
Call forward performed by the SIP side: Upon receipt of a Facility message with Call
Rerouting IE from the PSTN, the device initiates a SIP transfer process by sending a SIP
302 (including the Call Rerouting destination number) to the IP in response to the remote
SIP entity's INVITE message. The device then responds with a Disconnect message to the
PSTN side.
Call forward performed by the PSTN side: When the device sends the INVITE message to
the remote SIP entity and receives a SIP 302 response, the device sends a Facility
message with the same IE mentioned above to the PSTN, and waits for the PSTN side to
disconnect the call. This is configured using the CallReroutingMode.
For analog interfaces: The following methods of call forwarding are supported:
Immediate:
incoming call is forwarded immediately and unconditionally.
Busy:
incoming call is forwarded if the endpoint is busy.
No Reply:
incoming call is forwarded if it isn't answered for a specified time.
On Busy or No Reply:
incoming call is forwarded if the port is busy or when calls are
not answered after a specified time.
Do Not Disturb:
immediately reject incoming calls. Upon receiving a call for a Do Not
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