Yes, or course it can be there.
Don't assume that because you sent it once you don't need to send it
again. There is nothing that says any of the Allow-* or Accept-* headers
are scoped to a dialog. How long the commitment is to honor one of these
headers is unspecified. So you had best put them
Hi,
It's mentioned in RFC 3265, Section 3.3.7 that
Any node implementing one or more event packages SHOULD include an
appropriate "Allow-Events" header indicating all supported events in
all methods which initiate dialogs and their responses (such as
INVITE) and OPTIONS responses.
