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Outbound-11. Rohan Mahy rohan@ekabal.com. Changes. Merged keep-stun and keep-crlf into ‘keep’ Removed mention of TCP Keepalive. Fixed usage of option-tags

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outbound 11


Rohan Mahy


  • Merged keep-stun and keep-crlf into ‘keep’
  • Removed mention of TCP Keepalive.
  • Fixed usage of option-tags
    • UAC and Registrar always include outbound in Supported. Require is included in registrar response where outbound processing is being applied. UAC can include Require: outbound in a REGISTER if it likes.
  • UAC can request a flow token (for a dialog) via dialog-forming request that contains an ‘ob’ parameter in the Contact.
  • Lots of rewording text. Hopefully easier to read, but still pretty dense.
open issues 1
Open Issues #1
  • Today GRUU says you invalidate GRUU if the Call-ID in the register is different from the last one registered. Either:
    • 1) All flows from one instance need to register with the same Call-ID
    • 2) GRUU should check that an incoming REGISTER matches any Call-ID already registered by this instance.
  • Proposal: option 2
open issue 2
Open Issue #2
  • What error does the registrar send if it receives a REGISTER with Require: outbound, but the edge proxy doesn’t support outbound?
    • 420 is wrong
    • 400 is not very helpful
    • Don’t do that? (Require: outbound in a request)
    • Precondition failed?
    • New response code?
open issue 3
Open Issue #3
  • Alice registers with outbound. Bob sends an INVITE to Alice. How does the Alice get Bob’s subsequent in-dialog requests?
  • Today Alice’s first hop Record-Routes on her “outgoing” dialog-forming requests
  • Proposal: first hop proxy for Alice adds Record-Routes incoming dialog-forming requests if the top Route header has an ‘ob’ parameter (which will be presence because it put the ‘ob’ parameter in the first Path header).
open issue 4a
Open Issue #4a
  • Today the first hop MUST implement both keepalive types to be compliant
  • Why do we we still need the ‘keep’ parameter at all in the normal case when the client detects outbound registration? The UAC could just start sending keepalives then.
  • Possibilities
    • leave draft alone: but those parameters are ugly
    • keep the parameter for non-outbound uses of keepalives, but don’t use it for outbound
    • deprecate the parameter: is it still needed?
open issue 4b
Open Issue #4b
  • Proposal from Aki to replace the timed-keepalive parameter with a new header.
    • Flow-Timer: 120
  • Returned in REGISTER response, indicates how often the UAC needs to send keepalives, otherwise the first hop could declare the flow dead.
    • Default of Flow-Timer: 0 means server supports keepalives, but client can pick its own timers
open issue 5
Open Issue #5
  • Some folks want to do outbound-style keepalives without doing outbound.
  • How does server find out client can do keepalives (ex: so it can use longer registration intervals)?
  • Proposal: separate “keepalive” option-tag. UAC puts this in the Supported header.
  • How does client find out server can do keepalives?
    • either ‘keep’ URI parameter, or Aki’s new header
  • Do we care about this use case?
misc small stuff
Misc small stuff
  • Need to rewrite a complete example
  • Still a lot of room for rewording the text
  • Various typos and spelling missteaks
  • Process:
    • François Audet will be our Project Manager / Shepherd to try to keep us on track for timely next version