Ascotel IntelliGate 2025/2045/2065
Part 3 Planning a private network 663
• On which systems should calls be routed to the public network?
The traffic volume on a system on the public network (gateway PINX) is the sum
of the volume of traffic of the system's own traffic and the volume of traffic of
all the systems in the network that telephone out into the public network using
that system. The same applies accordingly for systems that forward calls from
one system to another (transit PINX).
• To which system are calls with the main number routed?
• On which systems are calls from the public network to be routed directly to
subscribers in the private network (direct dialling in)?
– Should the subscribers be obtainable via several DDI numbers?
– Should incoming calls be routed in accordance with break-in criteria? This
requires other direct dialling numbers for the correct CLIP display (see
"Break-In (Direct Dialling in for Virtual PISN Subscribers)", page 100).
• Where are additional connections to the public network required for overflow
routing compatible with emergency operation? (See also "Reliability aspects",
page 667.).
6.1.3.3 Traffic volume in the private network
With the results from the previous section and the previously estimated general
traffic volume you can roughly estimate the volume of traffic for each node and
for each connection between two nodes.
• How high the traffic volume is for the following types:
– Internal traffic
– Transit traffic
– Transferred calls
(e.g. calls transferred via a main number)
–Overflow routing
(within the private network or via the public network)?
• How is the volume of traffic spread out over time?
6.1.3.4 Determining the B channels
With the traffic volume estimate you can determine the number of B channels
required.
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