64 IETF – Vancouver, CANADA November 7, 2005 Tae-Gyu Kang tgkang@etri.re.kr

1. The Miscellaneous Transcoding Error Case and the Multi-Transcoding Scenariodraft-kang-sipping-transc-scenario-00.txt 64 IETF – Vancouver, CANADA November 7, 2005 Tae-Gyu Kang tgkang@etri.re.kr

2. Contents • Transcoding Error Cases • Multi-Transcoding Scenarios • Status • Characteristics • Next Step

3. Error Case: Inconsistency Signaling Path A a T a-b, c-d B b SIP SIP a a Tb A’ a’ T’ c’-b’ B b’ Media Media a’ b’ Media Path

4. Multi-Transcoding Scenario 2 A a T1 a-b T2 b-c T3 a-d d-e B d SIP SIP SIP SIP a Tb Tc a a Tb a Tb Td Tc A’ a’ T1’ a’-b’ T2’ b’-c’ T3’ a’-d’ B d’ Media Media Media Media a’ a’ a’ d’

5. Characteristics • Provide Informational or Guide for error handling in different networks • Miscellaneous Transcoding Error Case • Inconsistency between Signaling Path and Media Path • Need for New Error Reason Codes • Multi-Transcoding Scenario • Maximizing the possibility of successful call set up • Minimizing the number of transcoding

6. Status • Previous Documents Status • draft-taegyukang-sipping-transc-itg-00 • draft-kang-sipping-dtransc-requirement-00 • The draft was reviewed at IETF61 and by transcoding design team at IETF63. It was agreed to input for clarifications of the next revision of draft-ietf-sipping-transc-conf-00.txt and draft-ietf-sipping-transc-framework-02.txt. • Current Document • draft-kang-sipping-transc-scenario-00.txt • Whether 3pcc covers this document or not • Discriminator • response code (reason) • With requested and without requested

7. Next Steps • Refinement of Error Cases and Scenarios • Whether define new error reason code or not • Define the Maximum Tn • Addition History-Info