199 status update draft ietf sip 199 00 n.
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199 Status update draft-ietf-sip-199-00. Christer Holmberg. OPEN ISSUE #1: Sending 199 reliably. Should it be allowed to send 199 reliably? Claim against: it would require resources to be kept in order to handle the associated PRACK

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open issue 1 sending 199 reliably
OPEN ISSUE #1:Sending 199 reliably
  • Should it be allowed to send 199 reliably?
  • Claim against: it would require resources to be kept in order to handle the associated PRACK
  • Claim against: proxy which triggers 199 would have to terminate the associated PRACK
  • Claim for: if we in future want to use 199 to solve HERFP, it shall be allowed to send 199 reliably
  • PROPOSAL: Allow sending of 199 reliably, but add text saying that it may also be sent unreliably even if 100rel has been required
open issue 2 uas sending 199
OPEN ISSUE #2:UAS sending 199
  • Should an UAS be allowed to send 199?
  • May not be useful for a UA to send 199, but could be useful for B2BUA/AS type-of entities
  • PROPOSAL: Allow UAS to send 199
open issue 3 sip information in 199
OPEN ISSUE #3:SIP information in 199
  • Should the 199 response contain information (SIP headers, final response code etc) from the final response which triggered the 199?
    • May be useful if we at some point use 199 to solve the HERFP
  • PROPOSAL: If the initial request indicates support of sipfrag, it is recommended to include sipfrag message body in 199
open issue 4 199 option tag
OPEN ISSUE #4:199 option-tag
  • Do we need an option-tag to indicate support of 199, so that it is not sent to UACs not supporting it?
  • Intermediates may also have interest in receiving 199, which means they would have to be allowed to insert the option-tag (if not present in the request)
  • PROPOSAL: We don’t specify an option-tag