[Sip] why NO sent-by

[feng zhang <y01317@njupt.edu.cn>]

Hello all,

    Quote RFC3261 section 18.1.1 Sending Requests:

            Before a request is sent, the client transport MUST insert a value of
            the "sent-by" field into the Via header field.  This field contains
            an IP address or host name, and port.  The usage of an FQDN is
   			RECOMMENDED.  This field is used for sending responses under certain
   			conditions, described below.  If the port is absent, the default
   			value depends on the transport.  It is 5060 for UDP, TCP and SCTP,
   			5061 for TLS.

	But I can not find "sent-by" parameter in draft-ietf-sipping-basic-call-flows-01,
Why? The RFC uses "MUST" for it.

    Thanks.



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