internal NameAddressHeader(StringSegment displayName,
                            StringSegment uri,
                            SipParameters parameters)
 {
     DisplayName = displayName;
     Uri         = uri;
     Parameters  = parameters;
 }
 internal ViaHeader(StringSegment version,
                    StringSegment protocol,
                    StringSegment host,
                    SipParameters parameters)
 {
     Version    = version;
     Protocol   = protocol;
     Host       = host;
     Parameters = parameters;
 }