Working With Supplementary Services; Call Hold And Retrieve - AudioCodes Mediant 2000 User Manual

9.14

Working with Supplementary Services

The device supports the following supplementary services:

Call Hold and Retrieve (refer to ''Call Hold and Retrieve''

Call Transfer (refer to ''Call Transfer''

Call Forward (refer to ''Call Forward''

Call Waiting

Three-way conferencing (refer to Three-Way Conferencing)
The device SIP users are only required to enable the Hold and Transfer features. By
default, the Call Forward (supporting 30x redirecting responses) and Call Waiting (receipt of
182 response) features are enabled.
Notes:

9.14.1 Call Hold and Retrieve

Hold and Retrieve:

The party that initiates the hold is called the holding party; the other party is called the
held party.
as such, it's a help party.

After a successful Hold, the holding party hears a Dial tone (HELD_TONE defined in
the device's Call Progress Tones file).

After a successful retrieve, the voice is connected again.

The hold and retrieve functionalities are implemented by Re-INVITE messages. The IP
address 0.0.0.0 as the connection IP address or the string 'a=inactive' in the received
Re-INVITE SDP cause the device to enter Hold state and to play the Held tone
(configured in the device) to the PBX/PSTN. If the string 'a=sendonly' is received in the
SDP message, the device stops sending RTP packets, but continues to listen to the
incoming RTP packets. Usually, the remote party plays, in this scenario, Music on Hold
(MOH) and the device forwards the MOH to the held party.
You can also configure the device to keep a call on-hold for a user-defined time after which
the call is disconnected, using the ini file parameter HeldTimeout (refer to ''Configuring
Supplementary Services'' on page
SIP User's Manual
•
All call participants must support the specific supplementary service that
is used.
•
When working with certain application servers (such as BroadSoft's
BroadWorks) in client server mode (the application server controls all
supplementary services and keypad features by itself), the device's
supplementary services must be disabled.
The device can't initiate Call Hold, but it can respond to hold requests and
123).
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Document #: LTRT-68809