diff --git a/unmarshal.go b/unmarshal.go
index 92e0dcf..f301324 100644
--- a/unmarshal.go
+++ b/unmarshal.go
@@ -568,9 +568,11 @@ func unmarshalBandwidth(value string) (*Bandwidth, error) {
 	experimental := strings.HasPrefix(parts[0], "X-")
 	if experimental {
 		parts[0] = strings.TrimPrefix(parts[0], "X-")
-	} else if !anyOf(parts[0], "CT", "AS") {
+	} else if !anyOf(parts[0], "CT", "AS", "TIAS", "RS", "RR") {
 		// Set according to currently registered with IANA
 		// https://tools.ietf.org/html/rfc4566#section-5.8
+		// https://tools.ietf.org/html/rfc3890#section-6.2
+		// https://tools.ietf.org/html/rfc3556#section-2
 		return nil, fmt.Errorf("%w `%v`", errSDPInvalidValue, parts[0])
 	}