SIP User's Manual 456 Document #: LTRT-12804
Mediant 800 MSBG
complete), the user can retrieve the held call by pressing hook-flash.
The held call can’t be retrieved while Ringback tone is heard.
After the Consultation call is connected, the user can toggle between the held and
active call by pressing the hook-flash key.
Note: The Consultation feature is applicable only to FXS interfaces.
8.3.8.4 Call Transfer
The device supports the following call transfer types:
Consultation Transfer (see ''Consultation Call Transfer'' on page 456)
Blind Tran
sfer (see ''Blind Call Transfer'' on page 457)
Notes:
• Call transfer is initiated by sending REFER with REPLACES.
• The device can receive and act upon receiving REFER with or without
REPLACES.
• The device can receive and act upon receiving INVITE with REPLACES,
in which case the old call is replaced by the new one.
• The INVITE with REPLACES can be used to implement Directed Call
Pickup.
8.3.8.4.1 Consultation Call Transfer
The device supports Consultation Call Transfer (using the SIP REFER message and
Replaces header). The common method to perform a consultation transfer is described in
the following example, which assumes three call parties:
Party A = transferring
Party B = transferred
Party C = transferred to
1. A Calls B.
2. B answers.
3. A presses the hook-flash button and places B on-hold (party B hears a hold tone).
4. A dials C.
5. After A completes dialing C, A can perform the transfer by on-hooking the A phone.
6. After the transfer is complete, B and C parties are engaged in a call.
The transfer can be initiated at any of the following stages of the call between A and
C:
• Just after completing dialing C phone number - transfer from setup.
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