Hello,
I have a question with interpreting the wording of RFC3261 with respect
to how a SIP registrar should respond to REGISTER requests that do not
have a Contact: field in the message (this is the method specified for
performing a "binding fetch" from a registrar). According to 3261,
Section 10.3, Step 8:
8. The registrar returns a 200 (OK) response. The response MUST
contain Contact header field values enumerating all current
bindings. Each Contact value MUST feature an "expires"
parameter indicating its expiration interval chosen by the
registrar. The response SHOULD include a Date header field.
The way I originally read this is that a registrar should respond w/ the
expiration value chosen at the moment of registration (e.g. 3600). This
value would not change during the time in which that registration is
valid (not expired). However, what I am actually seeing from a real
registrar is that 200OK responses are given with the count-down to the
expiration (e.g. 3455, then 3300, then 2988) as subsequent REGISTER
requests w/ no Contact: headers are sent - this instead of what I
expected, the static (originally set) expiration value.
Anyone care to weigh in on the interpretation of the RFC's wording?
"Each Contact value MUST feature an "expires" parameter indicating its
expiration interval chosen by the registrar."
Thanks in advance,
Jeffrey D. Wright
System Test Engineering Manager
Aztek Networks, Inc.
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