Re-added errors to avoid API breakage

errors.go

@@ -106,6 +106,10 @@ var (
 	// has an invalid fingerprint
 	ErrSessionDescriptionInvalidFingerprint = errors.New("SetRemoteDescription called with an invalid fingerprint")
 
+	// ErrSessionDescriptionConflictingFingerprints indicates SetRemoteDescription was called with a SessionDescription that
+	// has an conflicting fingerprints
+	ErrSessionDescriptionConflictingFingerprints = errors.New("SetRemoteDescription called with multiple conflicting fingerprint")
+
 	// ErrSessionDescriptionMissingIceUfrag indicates SetRemoteDescription was called with a SessionDescription that
 	// is missing an ice-ufrag value
 	ErrSessionDescriptionMissingIceUfrag = errors.New("SetRemoteDescription called with no ice-ufrag")
@@ -114,6 +118,14 @@ var (
 	// is missing an ice-pwd value
 	ErrSessionDescriptionMissingIcePwd = errors.New("SetRemoteDescription called with no ice-pwd")
 
+	// ErrSessionDescriptionConflictingIceUfrag  indicates SetRemoteDescription was called with a SessionDescription that
+	// contains multiple conflicting ice-ufrag values
+	ErrSessionDescriptionConflictingIceUfrag = errors.New("SetRemoteDescription called with multiple conflicting ice-ufrag values")
+
+	// ErrSessionDescriptionConflictingIcePwd indicates SetRemoteDescription was called with a SessionDescription that
+	// contains multiple conflicting ice-pwd values
+	ErrSessionDescriptionConflictingIcePwd = errors.New("SetRemoteDescription called with multiple conflicting ice-pwd values")
+
 	// ErrNoSRTPProtectionProfile indicates that the DTLS handshake completed and no SRTP Protection Profile was chosen
 	ErrNoSRTPProtectionProfile = errors.New("DTLS Handshake completed and no SRTP Protection Profile was chosen")