Call Forward - AudioCodes Mediant 800B MSBR User Manual

•
Tel-to-IP call: source number of the original call.
•
IP-to-Tel call: destination number of the original call.
•
If the UseReferredByForCallingNumber parameter is set to 1, the source number
is taken from the SIP Referred-By header if included in the received SIP REFER
message.
This source number can also be used as the value for the 'Source Prefix' field in the
IP-to-Tel Destination Phone Number Manipulation table. The local IP address is used
as the value for the 'Source IP Address' field.
Note: Manipulation using the ManipulateIP2PSTNReferTo parameter does not affect
IP-to-Trunk Group routing rules.
30.6

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
Disturb, the 603 Decline SIP response code is sent.
Three forms of forwarding parties are available:

Served party: party configured to forward the call (FXS device).

Originating party: party that initiates the first call (FXS or FXO device).

Diverted party: new destination of the forwarded call (FXS or FXO device).
The served party (FXS interface) can be configured through the Web interface (see
Configuring Call Forward on page 481) or ini file to activate one of the call forward modes.
These modes are configurable per endpoint.
Notes:
•
When call forward is initiated, the device sends a SIP 302 response with a contact
that contains the phone number from the forward table and its corresponding IP
address from the routing table (or when a proxy is used, the proxy's IP address).
•
For receiving call forward, the device handles SIP 3xx responses for redirecting
calls with a new contact.
User's Manual 432
Mediant 800B MSBR
Document #: LTRT-12813