Query on Release
The originating switch routes the call
to the Donor Operator which then returns
a message to the originating network indicating
that the number has been ported away from
that operator. The Donor Operator must
track every number in its inventory and
must track which numbers are ported out.
In this case, the DO does not advise the
originating switch of the destination route,
only that the number is ported and the
originating switch must therefore conduct
a database query to find out where to send
the call.
This plan does not require the Donor Operator
to know the current operator of all of the
numbers ported out from its number ranges.
Once the customer leaves the Donor Operator,
there is no need for the Donor Operator to
be kept aware of where the customer has service.
Advantages
- No additional Donor Operator /Recipient
Operator trunk ports and trunks are required.
- Donor Operator call processing capacity
is not impacted
- Only a minor amount of SS7 signaling
capacity and link usage to accommodate
the inbound call.
Disadvantages
- Common Database required
- Connectivity to the common database
is required from all operators
- Query of the database is delayed slightly
when the call is first routed to the Donor
Operator
- All calls are processed twice by the
originating operator
- Call delay is introduced
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