AudioCodes Mediapack mp-11x, Руководство пользователя

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SIP User's Manual 358 Document #: LTRT-65409
MediaPack Series
7.13.3 Call Transfer
There are two types of call transfers:
„
Consultation Transfer
(REFER and REPLACES)
:
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 on-hooking the A
phone.
•
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.
„
Blind Transfer
(REFER)
:
Blind transfer is performed after we have a call between A and B, and party A decides
to immediately transfer the call to C 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.
7.13.4 Call Forward
Five forms of call forward 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.