I had a question come up about how to handle registrations when this
response is received. It is clear that if there is a desire to complete
the requested registration the expiration value must be increased to at
least the value returned in the 423.
The question is: what should be done when it is time to refresh that
registration? Is it acceptable for the UA to again try its own preferred
value rather than the value from the 423? Or should it continue using
the value from the first 423 in subsequent refreshes?
Presumably the registrar gave the 423 because it wanted to reduce the
number of register requests it has to process. If the UA continues to
use its preferred (smaller) value on every refresh attempt it will
double the number of register requests the registrar, with half of them
receiving 423 responses. So the UA using its preferred value for
refreshes seems counter productive.
So my conclusion is that if a UA receives a 423 response to a register
request, and it chooses to reattempt the register request, it SHOULD use
a value consistent with the 423 in the subsequent register request AND
in any subsequent refreshes to that registration.
Does this seem right?
Paul
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