Configuring Call Services - HP FlexNetwork MSR Series Configuration Manual

Configuring call services

More and more VoIP-based services are demanded as voice application environments expand. On
the basis of basic calls, new features are implemented to meet different application requirements of
VoIP subscribers.
Call waiting
When subscriber C calls subscriber A who is already engaged in a call with subscriber B, the call will
not be rejected if call waiting is enabled. Just like a normal call, subscriber C will hear ringback tones,
while subscriber A will hear call waiting tones as a reminder that a call is waiting on the line.
Subscriber A can answer the new call by pressing the flash hook or hanging up to end the call with
subscriber B. In the former case, subscriber B is held. In the latter case, subscriber A is immediately
alerted and can pick up the phone to answer the call originated by subscriber C (the waiting call).
Call hold
If subscriber A in a conversation with subscriber B presses the flash hook, the media session of
subscriber B is temporarily cut through and is held (in silent state or listening to waiting tones). The
system plays silent tones or dial tones to subscriber A, depending on the configuration. (The system
first plays dial tones and waits for the subscriber to dial. If the subscriber fails to dial within a period of
time, the system stops playing dial tones and the line stays on hold.). Subscriber A can resume the
call with subscriber B by pressing the flash hook again.
After pressing the flash hook, subscriber A hears dial tones and can initiate a new call. The setup
flow for the new call is the same as the one for ordinary calls.
Call forwarding
When the called party cannot answer the call, after receiving a session request, the called party
notifies in a response the calling party of the forwarded-to number. Then the calling party re-initiates
a session request to the new destination. This is call forwarding.
The system supports the following types of call forwarding:
•
Call forwarding unconditional—With this feature enabled on a voice subscriber line,
incoming calls will be forwarded to the predetermined destination, whether or not the voice
subscriber line is available.
•
Call forwarding busy—With this feature enabled on a voice subscriber line, an incoming call
will be forwarded to the predetermined destination when the voice subscriber line is busy.
•
Call forwarding no reply—With this feature enabled on a voice subscriber line, an incoming
call will be forwarded to the predetermined destination when the voice subscriber line is not
answered within a period of time. The time period is configured by executing the timer
ring-back command and defaults to 60 seconds.
•
Call forwarding unavailable—With this feature enabled on a voice subscriber line, an
incoming call will be forwarded to the predetermined destination when the voice subscriber line
is shut down by executing the shutdown command.
Call transfer
Subscriber A (originator) and subscriber B (recipient) are in a conversation. Subscriber A presses the
flash hook and the call is put on hold. Subscriber A dials another number to originate a call to
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