R2511-HP MSR Router Series Voice Configuration Guide(V5)

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Silent monitor and barge in services
Silent monitor service—Allows a supervisor to monitor active calls without being heard.
Barge in service—Allows a supervisor to participate in a monitored call, thus implementing three-party
conference. For example, subscribers A and B are in a conversation, and subscriber C is the supervisor.
If C wants to join the conversation, it sends a request to A. If A permits, the three-party conference can
be held. In this example, C is called the active participant of the conference, A is the voice mixer, and B
is the original participant of the conversation.
Silent monitor and barge in services can be considered as the extensions of three-party conference. To
distinguish them with traditional three-party conference, these two services are called three-party
conference in active participation mode.
Calling party control
The calling party control service allows the called party to resume the conversation with the calling party
by picking up the phone within the specified time. For example, subscriber A is the calling party;
subscriber B is the called party. The on-hook delay is set to m seconds on the voice subscriber line of
subscriber B. After the call between A and B is established, if the calling party A hangs up first, the call
is ended up. If the called party B hangs up first, it can resume the call with A by picking up the phone
within m seconds. After that, no matter how many times B hangs up within m seconds, it can resume the
call with A by picking up the phone.
In this example, after B hangs up for the first time, A hears silent tones from the headphone within m
seconds. If subscriber C dials subscriber B during this time, the telephone of B will not ring, and C will
hear busy tones.
Support for SIP voice service of VCX
Together with a server, the VCX implements the application of multiple voice features such as Silent
Monitor, Camp On, and FwdMail Toggle by using the HP proprietary SIP Feature messages. All these
voice features are called Feature service.
Call services configuration task list
For the service features of call waiting, call forwarding, incoming call barring, and outgoing call barring,
the system supports the following configuration methods:
• The system administrator performs configurations by using command lines on the device. This
method allows for more configuration options.
• Terminal subscribers perform configurations on telephones for convenience of use and for relieving
the burden on the system administrator.
By default, the device supports the following functions, without any configuration:
• Call backup function.
• Functions (processing transfer messages) of the recipient gateway and final recipient gateway.
• Functions (processing call hold/recover request messages) of the gateway on the held party side.
• Functions (processing forwarding messages) of the gateway that receives forwarding request
messages, namely, the originating gateway.