1. The 5th CJK NGN Working Group Meeting March 28~29, 2005, Tokyo, Japan Internet Telephony in KOREA Hyub, CHOI TTA hyubchoi@tta.or.kr

2. The 5 th CJK NGN Working Group Meeting 2 Overview – Past, Now & future TTA’s role in Internet Telephony Follow-up schedule Contents

3. The 5 th CJK NGN Working Group Meeting 3 Overview In the past -Could not receive calls ※ UMS number ‘030’ prefix has been used temporarily -Mainly ‘IP-to-PSTN’ outbound calls only Now & Future -Can request IP Telephone numbers from ITSP and Operator now that ‘070’ prefix number is allowed -Can enjoy ‘Nation wide’ Single call area with reasonable price

4. The 5 th CJK NGN Working Group Meeting 4 TTA’s Role In order to get 070 numbers, ITSP & operators MUST achieve ‘TTA Certification for Internet Telephony QoS’ TTA requires Internet Telephony Service of each ITSP or operator at least that – ITU-T G.107 R value be above 70 (MOS 3.6) – End-to-end delay be less than 150ms – Call successful rate be more than 95% Certification status (2005. 3.15) – 8 Special category telecommunications operator achieved TTA certifications – 4 operators among them already acquired ‘070’ numbers – Quality assessment will be carried out for common carriers

5. The 5 th CJK NGN Working Group Meeting 5 Follow-up schedule Obstacles - Interconnection issues among common carriers and special category operators - Specific charging rates Until July this year - expect general agreements to be made in early April, 2005 - Interoperability tests will be carried out by TTA - In July 2005, Korean people will see high-quality & lower price pure internet telephony service on.

6. The 5 th CJK NGN Working Group Meeting 6 Thank you for your attention