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Numbering Plan in Japan. N(S)N. Area Code+ Local Exchange Number. Subscriber Number. National Prefix. Fixed Phone. 0 ABCDE FGHJ. Subscriber Number. Operator Assigned. 0 90 CDE FGHJK. Mobile Phone. 0 80 CDE FGHJK. PHS 1). 0 70 CDE FGHJK. UPT. 0 60 CDE FGHJK. IP Phone.
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Numbering Plan in Japan N(S)N Area Code+ Local Exchange Number Subscriber Number National Prefix Fixed Phone 0 ABCDE FGHJ Subscriber Number Operator Assigned 0 90 CDE FGHJK Mobile Phone 0 80 CDE FGHJK PHS1) 0 70 CDE FGHJK UPT 0 60 CDE FGHJK IP Phone 0 50 CDEF GHJK Pager 0 20 CDE FGHJK 0 120 DEF GHJ Freephone 0 800 DEF GHJK Shared Cost 0 570 DEF GHJ Premium Rate 0 990 DEF GHJ 1) PHS(Personal Handy-phone System)
Number Assignment Scheme Administrator Consultation on Assignment Scheme “Study Group on Telecommunications Number” (MPHPT1)) Assignment Request Recent Topics: -Numbers (of blocks) to be assigned-Purpose of assignment-Service plan and revenue forecast • Numbering Plan for IP telephony-Revision of requirement for number assignment-ENUM Deploymentetc. KDDI Participation and Contribution NTT companies Operators 1)MPHPT:Ministry of Public Management, Home Affairs, Post and Telecommunication
Numbering plan for IP-Telephony • The Study Group has recommended that IP-Telephony be categorized to 2 type of services. • High Quality IP-Telephony ：Number assigned as fixed hone =strongly regulated ( +81ABCDEFGHJ ) • Not High Quality IP-Telephony ：New Category Services “IP-Phone” ( +8150CDEFGHJ ) • Telecom Business Law, revised by the government in July 2003, repealed the telecom carriers’ categories(Type1,Type2) for market de-regulation. • “Rules for Telecommunications Number” is now under development to be revised, to suit the repeal (indicated above)
Requirement for Fixed Phone Numbers assignment (applied to High Quality IP-Telephony) Requirement 1: That the operator install switching facilities which accommodate and identify access lines for fixed phone Requirement 2: That the facilities providing fixed phone service maintain technical standard compatibility and that stability be guaranteed for providing service (quality of voice, connection establishment and stability, etc) Requirement 3: That, especially onto fixed phone service facilitating IP technologies, technical action and/or other action be taken to deter using a geographic telephone number at the numbering area other than where the telephone number is assigned Requirement 4: That consumer demand be forecasted at the appropriate level for every local exchange number requested, and that service be certainly provided as planned Translated from the final report of the Study Group on Telecommunications Number FY2002 (issued in Sept 2003)
New Category Services “IP-Phone” GK ＶｏＩＰ GW diffusion PSTN IP Network Telephone SW delay loss Could not measure qualities of IP telephony because values for IP telephony qualifications (i.e.IP transmission quality of an IP network or terminal characteristics) often varies IP phone POTS (+81-50-CDEFGHJK) (+81-ABCDEFGHJ) “Class A” “Class B” “Class C” Quality equivalent to Fixed phone Quality equivalent to Mobile phone Transmission rating factor R 1) The number range 050 + 8 digits are assigned to “Class C” IP telephony.2) More than 80 More than 70 More than 50 Fixed Phone numbers (0ABCDEFGHIJ) are assigned to “Class A” IP telephony End-to-end delay Less than 100ms/150ms3) Less than 150ms Less than 400ms 1)Defined in ITU-T Recommendation G.1072)Defined in mid-2002 by revised Japanese Law “Rules for Telecommunications Number” based on the final report of “the Study Group on IP Network Technology”(MPHPT)3)100ms or 150ms : TBD
