Nortel VoIP Gateway, Configuration Manual

Page: 198 / 220

198 Call Hold and Retrieve features
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Call Transfer
There are two types of call transfers:
• Supervised Transfer
• Blind Transfer
The common way to perform a consultation transfer is as follows:
In the transfer scenario there are three parties:
A - transferring, B - transferred, C - transferred to.
a A Calls B.
b B answers.
c A presses the hook flash and puts B on hold (party B will hear a hold tone)
d
A dials C.
e After A completed dialing C, A can perform the transfer by hanging up his phone.
f
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:
a Just after completing dialing C phone number - Transfer from setup.
b
While hearing ring back - Transfer from alert.
c While speaking to C - Transfer from active.
A Blind transfer is performed after we have a call between A and B, and A party 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 a supervision transfer only skipping
the consulting stage).
The VoIP Gateway can not initiate a blind transfer, but they can participate in such transfer as B
and C parties.
Call Forward
There are three kinds of call forwards:
• Immediate (CFAC) — Any incoming call is forwarded immediately and unconditionally.
• Busy (CFB) — Incoming call is forwarded if the endpoint is busy.
• No reply (CFNA) — The incoming call is forwarded if it was not answered for a specified
time.
There are three parties participating in call forward:
• Served party — the party that is configured to forward the call.