Hi,
A numbering plan identifies each VoIP endpoint and application in the network with a unique telephone number. Numbering plan design should evaluate both current requirements and potential growth requirements to avoid the need to renumber as more users connect to the voice network. There are diffrent types of numbering plans like E.164 plan(International public numbering plan),national numbering plans and private numbering plans. More of this can be read at the link below
http://ciscoarticles.com/Voice-Over-IP/721.html
As far as the number type is concerned, every subscriber in a mobile network is uniquely identified by a mobile station ISDN or public switched telephone network (PSTN) number. The type of Number(TON) is used for many purposes, one of which is for billing the end users.
The TON information is displayed as an attribute-value (AV) pair in the AAA accounting records that are sent to the RADIUS server for billing purposes. The format is as follows:
caller-type-of-number=value
The value can be any of the following, which are specified in the International Telecommunication Union Telecommunication Standardization Sector (ITU-T) specification Q.931 dated March 1993.
•
National—refer to ITU-T Recommendation I.330
•International—refer to ITU-T Recommendation I.330
•Subscriber (local)—refer to ITU-T Recommendation I.330
•Network specific—an administrative or service number that is specific to the serving network (for example, a number used to access an operator)
•Unknown—the user or the network has no knowledge of the type of number.
HTH
Regards
Nitesh
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