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Issue 2: caller prefs param?
Currently, instance ID is a callee capability parameter
Implication: can use it in Accept or Reject Contact header fields
Would allow routing to instance ID without GRUU, sort of
Caller prefs routing not reliable, no guarantees
This is part of reason why original instance approach for transfer was rejected in favor of GRUU
Proposal
Keep as callee cap (it IS a characteristic)
Add text advising strongly against usage with Accept/Reject contact – use a GRUU instead
PPT Version