[Sip-implementors] behaviour of UA if no Expires header/parameter in REGISTER respons

[diddl du]

Hi,

RFC 3261 says that a registrar MUST return either an Expires header or an Expires parameter. However, I could not find written explicitement anywhere what the UA shall do if a 200 OK to a REGISTER do not contain an Expires header/parameter. I can imagine three possible actions:

1. Even though the response is 200 OK, the request is considered failed. No registration status change has taken place. The UA may try again. (My preference.)
2. The expiry time is considered 0. The UA may try again. (I don't like that.)
3. This is a special interpretation of what "malforme" means (completely missing), and the default time for that is assumed. (Ok, but 1 is preferred.)

Ok, that is what I think. Please let me know what is the correct behaviour, or whether I missed something in the RFC (its so much).

Merci!

Diddl

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