Consultation / Alternate; Call Transfer - 3Com VCX v7111 User Manual

Receiving Hold / Retrieve
When an active call receives REINVITE message with either the IP address 0.0.0.0 or
the inactive string in SDP, the gateway stops sending RTP and plays a local Held Tone.
When an active call receives REINVITE message with sendonly string in SDP, the
gateway stops sending RTP and listens to the remote party. In this mode, it is expected
that on-hold music (or any other hold tone) is to be played (over IP) by the remote party.

Consultation / Alternate

The Consolation feature is relevant only for the holding party (applicable only to the
V7111/FXS gateway).
After holding a call (by pressing hook-flash), the holding party hears 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 cannot 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.

Call Transfer

There are two types of call transfers:
Consultation Transfer (REFER + 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 completed dialing C, he can perform the transfer by onhook the A phone.
After the transfer is completed B and C parties are engaged in a call.
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3Com VCX V7111 VoIP Gateway User Guide