diff --git a/.changeset/brave-chicken-eat.md b/.changeset/brave-chicken-eat.md
new file mode 100644
index 000000000..c15b0c091
--- /dev/null
+++ b/.changeset/brave-chicken-eat.md
@@ -0,0 +1,5 @@
+---
+"github.com/livekit/protocol": patch
+---
+
+Add missing SIP status attribute.
diff --git a/livekit/attrs.go b/livekit/attrs.go
index 2102d8b87..2424f27c6 100644
--- a/livekit/attrs.go
+++ b/livekit/attrs.go
@@ -16,4 +16,8 @@ const (
 	// AttrSIPPhoneNumber attribute contains number external to LiveKit SIP (caller for inbound and called number for outbound).
 	// This attribute will be omitted if HidePhoneNumber is set.
 	AttrSIPPhoneNumber = AttrSIPPrefix + "phoneNumber"
+	// AttrSIPCallStatus attribute contains current call status for a SIP call associated with the participant.
+	//
+	// SIP participant is ready when it reaches "active" status.
+	AttrSIPCallStatus = AttrSIPPrefix + "callStatus"
 )