Editing Telephone numbering plan (section)

==Numbering plan indicator==
Signaling in telecommunication networks is specific to the technology in use for each link. During signaling, it is common that additional information is passed between switching systems that is not represented in telephone numbers, which serve only as network addresses of endpoints. One such information element is the numbering plan indicator (NPI). It is a number defined in the ITU standard [[Q.7xx|Q.713]], paragraph 3.4.2.3.3, indicating the numbering plan of the attached telephone number. NPIs can be found in [[Signalling Connection Control Part]] (SCCP) and [[short message service]] (SMS) messages. {{As of|2004}}, the following numbering plans and their respective numbering plan indicator values have been defined:

{| class="wikitable"
! NPI || Description || Standard
|-
| 0 || unknown || 
|-
| 1 || ISDN Telephony || [[E.164]]
|-
| 2 || generic ||
|-
| 3 || data || [[X.121]]
|-
| 4 || [[telex]] || F69
|-
| 5 || maritime mobile || [[E.210]] and [[E.211]]
|-
| 6 || land mobile || [[International Mobile Subscriber Identity|E.212]]
|-
| 7 || ISDN/mobile || [[E.214]]
|-
|}