User's Manual 538 Document #: LTRT-27045
Mediant 1000B Gateway & E-SBC
Note: Only one call can be suspended per trunk. If another suspend request is
received from a BRI phone while there is already a suspended call (even if done by
another BRI phone connected to the same trunk), the device rejects this suspend
request.
26.4 Consultation Feature
The device's Consultation feature allows you to place a call on hold and then make a
second call to another party.
After placing a call on hold (by pressing hook-flash), the holding party hears a dial
tone and can 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 toggle between the held and
active call by pressing the hook-flash key.
Note: Consultation calls are applicable only to FXS interfaces.
26.5 Call Transfer
This section describes the device's support for call transfer types.
26.5.1 Consultation Call Transfer
The device supports Consultation Call Transfer using the SIP REFER message and
Replaces header. The common method to perform consultation transfer is described in the
following example, which assumes three call parties:
A = transferring party
B = transferred party
C = transferred to party
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 on-hooks the phone to transfer the call so that the call
is established between B and C.
Transfer can be initiated at any of the following stages of the call between A and C:
Immediately after A completes dialing C (transfer at call setup)
While A hears a ringback (transfer from alert)
While A speaks to C (transfer from active)
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