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9-digit NSN phone numbers and VOIP

timf

Casual Member
There are some places in the UK with the standard (01xxx) four-digit area-code but which have both six-digit (10-digit NSN after the initial 0) and five-digit (9-digit NSN) phone numbers. Eg: 01xxx-666666 or 01xxx-55555

Does anyone know
What is going to happen to the 9-digit phone numbers when PSTN ceases?
Will all users be forced to change to 10-digits NSN (ie: a new number) on VOIP?​

Area codes affected include: 01204, 01208, 01254, 01276, 01297, 01298, 01363, 01364, 01384, 01386, 01404, 01420, 01460, 01461, 01480, 01488, 01524, 01527, 01562, 01566, 01606, 01629, 01635, 01647, 01659, 01695, 01726, 01744, 01750, 01768, 01827, 01837, 01884, 01900, 01905, 01935, 01946, 01949, 01963 and 01995.

Wiki info
 

Mark.J

Administrator
Staff member
ISPreview Team
Numbers are managed separately from the phone network itself, and a new system is currently being designed for all that, primarily to make number portability easier. But at present I've not heard of any plans to change existing numbers, except for this of course (not the same thing):

 

uno

ISP Rep
This isn't an issue as it stands. The 9 digit numbers can be ported to VoIP and work the same as a 10 digit number.

VoIP hardware can be coded to accept a full 9 or 10 digit number. With most dial plans immediately dialling after it sees the complete 10 digits.

Worst case is that after 9, you end up having to wait a second or two for the VoIP device to see if another digit is being dialled before it passes what it has over to the network. No different to if there was no dial plan at all and the device just passed over everything but waited after the last digit (i.e international numbers with varying lengths).

This of course does not impact digital VoIP devices which send through the number as dialled and that is immediate and the delay will only affect ATAs or routers with inbuild phone sockets so existing hardware can be used.

Matt
 

Meatball

Top Member
The biggest issue for BT currently is local dialling so that is what they want from Ofcom. Once that is out the way BT could look at the 50 or so exchanges and if geographical numbers are in short supply change the numbers (as they did when linked numbering was introduced for Subscriber Trunk Dialling).

However with continued decline in landlines and new businesses adopting VoIP straight away it may not be important and 9 digit numbers can continue.

What would be good is if BT explained properly where the number porting issues exist to their BT Digital Voice or to other providers. Technically it shouldn't fail so why are issues still occurring. According to Ofcom its a right. https://www.ofcom.org.uk/about-ofco...news/we-fight-for-your-right-to-port-a-number
 
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