9.15.4 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.
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.
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).
:
Notes:
•
•
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.
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