Call Transfer - AudioCodes Mediant 600 User Manual

Note:
8.3.9.4

Call Transfer

The device supports the following call transfer types:

Consultation Transfer (see ''Consultation Call Transfer'' on page 328)

Blind Transfer (see ''Blind Call Transfer'' on page 329)
Notes:
8.3.9.4.1 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.
•
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.
SIP User's Manual
The Consultation feature is applicable only to FXS interfaces.
•
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.
328
Mediant 600 & Mediant 1000
Document #: LTRT-83308