Consultation / Alternate; Call Transfer; Call Forward - AudioCodes Mediant 1000 User Manual

9.1.2

Consultation / Alternate

The consultation feature is relevant only for the holding party (applicable only to the
Mediant 1000/FXS module).
After holding a call (by pressing hook-flash), the holding party hears a dial tone and
can now initiate a new call, which is called a consultation call.
While hearing a dial tone, or when dialing to the new destination (before dialing is
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 switch between the held and
active call by pressing hook-flash.
9.1.3

Call Transfer

There are two types of call transfers:
Consultation Transfer (REFER and REPLACES)
Blind Transfer (REFER)
The common way to perform a consultation transfer is as follows:
In the transfer scenario there are three parties:
Party A = transferring, Party B = transferred, Party C = transferred to.
A Calls B.
B answers.
A presses the hook-flash and puts B on-hold (party B hears a hold tone)
A dials C.
After A completes dialing C, A can perform the transfer by onhook of the A phone.
After the transfer is completed, 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 to C:
Just after completing dialing C phone number - Transfer from setup.
While hearing Ringback – Transfer from alert.
While speaking to C – Transfer from active.
Blind transfer is performed after we have a call between A and B, and party A decides to
transfer the call to C immediately without speaking with C.
The result of the transfer is a call between B and C (just like consultation transfer only
skipping the consultation stage).
Note the following SIP issues:
Transfer is initiated by sending REFER with REPLACES.
The gateway can receive and act upon receiving REFER with or without REPLACES.
The gateway 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.
9.1.4

Call Forward

Five forms of call forward are supported:
Immediate: Any incoming call is forwarded immediately and unconditionally.
Busy: Incoming call is forwarded if the endpoint is busy.
No Reply: The incoming call is forwarded if it isn't answered for a specified time.
SIP User's Manual 268
Mediant 1000
Document #: LTRT-83301