Hardware Compatibility With Voice; Voip Features - HP FlexNetwork MSR Series Configuration Manual

5. The session application collects the digits dialed by the user.
6. The session application compares the collected digits with the match template while collecting
digits.
7. After finding a match template for the called number, the originating VoIP gateway maps the
number to the terminating VoIP gateway.
8. The originating VoIP gateway initiates a VoIP call to the terminating VoIP gateway over the IP
network and establishes a logical channel for the call to send and receive voice data.
9. The terminating VoIP gateway receives the call from the IP network and seeks the destination
telephone according to the match template. If the call is to be processed by a PBX, the
terminating VoIP gateway passes the call through PSTN signaling to the PBX for processing
until the destination telephone is connected. When the calling party or the called party hangs up,
the conversation ends.

Hardware compatibility with voice

Voice is not available on the following routers:
•
MSR900.
•
MSR93X.
•
MSR1000.
•
MSR30-11E.
•
MSR30-11F.

VoIP features

•
Silence compression
To reduce the amount of voice traffic to be transmitted, VoIP can automatically detect the time
ranges of silence in a conversation, stop generating voice traffic, and send a small number of
silence packets within these time ranges.
•
Comfort noise
Silent gaps during a call can be filled by comfortable background noise.
•
QoS
As voice services are highly time-sensitive, the priority transmission of voice packets must be
guaranteed. Some measures such as PQ, CQ, WFQ, CBQ, and RTP can be adopted on the
sender side for this purpose. To ensure an adequate bandwidth for voice transmission, adopt
the CAR mechanism to implement traffic classification and policing.
•
Fax over IP
Based on VoIP, the FoIP system is responsible for setting up of fax channels and receiving and
sending fax data. FoIP implementation involves modulation and demodulation, fax protocol
processing, and IP channel maintenance.
•
One-stage dialing and two-stage dialing
One-stage dialing and two-stage dialing are methods used to connect the calling user to the
called number. If a PBX sends the called number to the VoIP gateway, the VoIP adopts the
one-stage dialing to connect the calling user. If the PBX does not send the called number to the
VoIP gateway, the VoIP gateway adopts the two-stage dialing and plays prompt tones to guide
the calling user to enter information such as a called number.
•
Automatic busy-tone detection
Different PBXs are likely to play different busy tones with different frequency spectra. Therefore,
it is hard to recognize a specific busy-tone feature. With the smart busy tone identification
technology, the VoIP gateway samples, calculates, and analyzes the busy tones played by the
2