SIP header is a part of a SIP message that expresses information about the message. It is planned as a sequence of header fields.
SIP header fields generally follow the same rules as HTTP header fields. Header fields are explained as Header: field, where Header is used to acts as the header field name, and field is the set of tokens that carries the information. Every field comprises of a field-name followed by a colon (":") and the field-value (i.e., field-name: field-value).
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