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understand the QoStream™ product family is to understand
how tomorrow's services can be deployed today in a highly
cost-effective way. Implementing an ESON architecture with
Amedia's QoStream™ products provides the scalability,
reliability, security, and flexibility to meet the needs of
the most demanding customer. |
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| For a call originated by a QoStream™
subscriber, the PG1000 communicates the signaling packets,
including the call-ED and call-ER information, through
the network to the MGCP/NCS Call Agent. The Call Agent
determines the call is a PSTN call from a specific QoStream
network subscriber, using the call-ED information and
pre-registration of the QoStream PG1000 subscriber,
and it conducts a control session with the Trunking
Gateway, the control means and details of which depend
on the specific trunking gateway and Call Agent. The
Trunking Gateway normally provides a conversion between
VoIP packets |
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on the QoStream side to TDM signals on individual trunks on
the PSTN switch side. An idle trunk on the PSTN side of the
Trunking Gateway is identified and reserved, and the Call
Agent instructs the Premises Gateway to utilize the QoStream
network connection to the Trunking Gateway, identifying the
specific idle trunk for the call, using a pre-provisioned
VLAN. The Trunking Gateway passes the call-ED information
to the processor of the appropriate PSTN switch, the control
means and details of which depend on the specific Trunking
Gateway and PSTN switch, and the PSTN switch processor completes
the call between the Trunk Gateway trunk and the call-ED line
in a manner similar to that resulting from a PSTN incoming
call on its trunk side. Disconnection by either end results
in a PSTN path disconnection and a disconnection of the call
within the QoStream network.
For an incoming call from the PSTN to a QoStream subscriber,
the PSTN switch processor completes the call to the PSTN side
of the Trunking Gateway in the normal manner of a PSTN call
and conducts a control session with the Call Agent, including
passing the call-ED party and reserved trunk information.
The Call Agent determines that the call is for a specific
QoStream subscriber through pre-registration of the specific
PG1000 subscriber, and instructs the destination PG1000 to
connect through the QoStream network to the Trunking Gateway,
identifying the specific idle trunk for the call, using a
pre-provisioned VLAN. Disconnection by either end results
in a PSTN path disconnection and a disconnection of the call
within the QoStream network.
For a call originated by a QoStream subscriber to another
QoStream subscriber within the network, the originating PG1000
communicates the signaling packets, including the call-ED
and call-ER information, through the network to the Call Agent.
The Call Agent determines the call is entirely within the
QoStream network using the call-ED/call-ER information and
pre-registration of the QoStream PG1000 subscribers. The Call
Agent instructs to endpoint PG1000s to utilize the most efficient
QoStream network connection to host the call within the network.
Disconnection by either end results in a PSTN path disconnection
and a disconnection of the call within the QoStream network.
The voice packets uses the highest tier of QoStream network
elements necessary to complete the call, for example not requiring
involvement of the Core Switch if the call is within a single
Aggregation Switch community, thereby minimizing congestion
on the GbE links in the network. If the desired call was between
PG1000s in two Aggregation Switch communities, the call packets
would traverse the core switch that interconnects those Aggregation
Switches.
The QoStream network subscribers can use VoIP or POTS telephones
instruments without any functional loss. Subscriber pre-registration
with the Call Agent identifies a telephone number with a VoIP
phone Internet address on any of the PG1000 LAN 1-4 ports or
as a TEL A-D port for a POTS telephone device.
Normally, the most suitable service guarantees for provisioning
of voice services is Guaranteed Bandwidth owing to the customer
sensitivity to impairments such as dropped packets, delay, and
jitter in voice services. Using these service guarantees, voice
traffic is given preference everywhere in the QoStream network
data plane relative to Best Effort traffic, providing a POTS
level of Quality of Service for voice.
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