What should the behavior of a registrar be if it receives a REGISTER request w/ 
an Expires: header that has no expiration parameter?  In other words, instead 
of getting

Expires: 3600

it gets

Expires: 

I looked briefly through Section 7 of 3261 and didn't immediately see anything 
addressing this anomalous case.  On the one hand I could see a case for just 
dropping the message (since it's malformed); on the other hand, a robust 
implementation might want to reply w/ 200 OK that has a default expiration 
value associated with it.

Thanks,

Jeffrey Wright
System Test Engineering Manager
Aztek Networks

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