Michael Proctor and Robert Sparks are correct, as an examination of
the order of steps in section 16 makes clear:
16 Proxy Behavior
16.3 Request Validation
3. Max-Forwards check
The Max-Forwards header field (Section 20.22) is used to limit the
number of elements a SIP request can traverse.
If the request does not contain a Max-Forwards header field, this
check is passed.
If the request contains a Max-Forwards header field with a field
value greater than zero, the check is passed.
If the request contains a Max-Forwards header field with a field
value of zero (0), the element MUST NOT forward the request. If
the request was for OPTIONS, the element MAY act as the final
recipient and respond per Section 11. Otherwise, the element MUST
return a 483 (Too many hops) response.
16.6 Request Forwarding
3. Max-Forwards
If the copy contains a Max-Forwards header field, the proxy
MUST decrement its value by one (1).
Dale
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