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A network operator makes copies of the CDB and queries it to find out to which network to send a call.
According to RFC3482, this is also known as All Call Query (ACQ) and is highly efficient and scalable.
This is also known as "indirect routing" and is highly inefficient as it is wasteful of transmission and switching capacity.
Because of its donor dependent nature, indirect routing also means that if the donor network develops a fault or goes out of business, the customers who have ported numbers out of that network will lose incoming calls to their numbers.
Emphasising its importance to Aliv, Mr Blackburn told Tribune Business: “There’s a significant segment of the market that’s waiting for number portability to be able to switch to Aliv, and the sooner we manage to make it happen as an industry, that segment will have a choice.
“It’s not hampering our plans in any major way, as we’ve started selling our product to a lot of people happy to have a new number, but there’s a segment of the market that wants to bring their number to Aliv, and we’re working assiduously to make that happen.” Mr Blackburn added: “We look forward to the day when this is available to everyone, and are playing our part to make it happen with all the other actors in the industry.’ Emphasising that the missed February 14 launch date was not the fault of any particular party, the Aliv chief officer said: “There’s no point in trolling over that. All the cogs have to turn at the same time.” Mr Blackburn had previously told Tribune Business that the segment waiting for number portability accounted for at least 10-20 per cent of the Bahamian mobile market, and were higher spenders, making them important targets for Aliv as it seeks to rapidly build a customer base and share.
One of the very few countries not to use ACQ/CDB is the UK, where once a number has been ported, calls to that number are still routed via the donor network.
“The launch of MNP (mobile number portability) requires both operators to implement various changes to their networks and business processes,” URCA said.
“Commencing during the last week in January, URCA carried out an assessment of the operators’ readiness for MNP, and has determined that neither operator is in a position to ensure a successful implementation of MNP by 14 February 2017, the date initially proposed.
A significant technical aspect of MNP is related to the routing of calls or mobile messages (SMS, MMS) to a number once it has been ported.
There are various flavours of call routing implementation across the globe but the International and European best practice is via the use of a central database (CDB) of ported numbers.The fact there’s a few weeks’ delay, while disappointing, is the right thing for the consumer.