Add missing Max-Forwards header to CANCEL #573
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According to RFC3261 Max-Forward header has to be included in all requests:
8.1.1 Generating the Request
A valid SIP request formulated by a UAC MUST, at a minimum, contain
the following header fields: To, From, CSeq, Call-ID, Max-Forwards,
and Via; all of these header fields are mandatory in all SIP
requests.