Reason%20Header%20for%20Preemption

1
Reason Header for Preemption

• draft-polk-sipping-reason-header-for-preemption-00
  
• James M. Polk
• 11 Nov 03

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What this is for

• Informing remote the UA and SIP elements of a
  purposeful premature end to a session
• Two conditions defined here
• At the UA
• Within the network
• Appropriate mechanism is using a Reason Header
  contained within a BYE request

3
Proposed Syntax

• IANA section of 3326 allows a SIP, Q.850 or token
  value for cause
• This ID proposed 2 tokens
• Preempted_UA
• Preempted_Network
• For example Reason preempted_UA

4
Issues and suggestions

• Suggestion
• Dont use token, but use a new namespace
  preemption
• Suggested syntax becomes
• Reason preemption cause1 text"Network
  Preemption"
• Reason preemption cause2 text"UA
  Preemption
• Issue not sure this is currently allowed by RFC
  3326

5
Next Steps

• Ask to be reviewed by SIP WG to become WG item
• As a logical follow-on effort to the
  Resource-Priority Header