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Enhancing MBus Control Sessions in SDP for SIP Devices

This document proposes a method to establish an MBus control session within the Session Description Protocol (SDP). It aims to bootstrap MBus sessions between SIP devices that may be geographically close yet not topologically connected. The proposal addresses the discovery and keying issues while being compatible with existing NAT and firewall traversal techniques, such as STUN and TURN. While it does not tackle congestion problems, it suggests a separation and re-factoring of call control verbs and notifications for more efficient communication, detailing specific call control actions like make-call, end-call, accept, alert, and more.

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Enhancing MBus Control Sessions in SDP for SIP Devices

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  1. MBus Extensions • Rohan Mahy • rohan@cisco.com

  2. draft-mahy-mmusic-mbus-sdp • Proposes way to setup an mbus control session in SDP • Bootstraps Mbus session between SIP devices which may be geographically close, but not topologically close • Solves discovery and keying problem • Works with existing NAT/FW traversal techniques (ex: STUN/TURN) • Does not solve congestion problem

  3. draft-mahy-mmusic-remotecc • draft-ietf-mmusic-mbus-call-control was WG item, but expired long ago. • Propose split between call control verbs and call control notifications • Propose re-factoring of call control verbs • make-call (sends an INVITE) end-call (sends a BYE, CANCEL, or 603) accept (accepts an incoming call) alert (returns a 180 Ringing provisional response) ? reject (reject an incoming call with a specific response/reason) move (redirect or single-step transfer to a specific target URI) complete-transfer (replace two active/held calls with one) hold (invoke the locally defined hold mechanism) retrieve (retrieve a call from hold) join (merge two calls into one conference) add-party (add a party to a conference) drop-party (remove a party from a conference)

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