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Some Transport Requirements for Telephony / MM Conferencing (non-exhaustive)

Some Transport Requirements for Telephony / MM Conferencing (non-exhaustive). Jörg Ott TELES AG / Universität Bremen TZI. Applications. Call setup / call control Registration, authorization, (monitoring) Intra-/inter-domain reporting Remote device control …

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Some Transport Requirements for Telephony / MM Conferencing (non-exhaustive)

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  1. Some Transport Requirements forTelephony / MM Conferencing(non-exhaustive) Jörg Ott TELES AG / Universität Bremen TZI 43rd IETF - RUTS BOF

  2. Applications • Call setup / call control • Registration, authorization, (monitoring) • Intra-/inter-domain reporting • Remote device control • … • No traditional bulk data transfer 43rd IETF - RUTS BOF

  3. Sample Types of Traffic Call Remote control Reporting 1 1 2 3 4 5 6 1 5 9 1 1 2 4 1 1 2 3 4 43rd IETF - RUTS BOF

  4. Transport Requirements • End-to-end reliability • Implicit “connection setup” • Robust against denial of service attacks • Tunable parameters:per “connection” and per datagram • reliability level, timeout, retransmissions, … • initial congestion window • substitution / (forced) expiration of queued data 43rd IETF - RUTS BOF

  5. Current Solutions Application layer reliability • Partially PDU-specific timeouts • fixed timeouts + backoff mechanisms • Simple acknowledgement mechanism • lock step or windowing • Allow reliable + unreliable data within the same “connection” • Solutions tailored to respective problem • but general purpose transport desirable 43rd IETF - RUTS BOF

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