diff --git a/.changeset/tiny-pans-smell.md b/.changeset/tiny-pans-smell.md
new file mode 100644
index 00000000..b4d004d4
--- /dev/null
+++ b/.changeset/tiny-pans-smell.md
@@ -0,0 +1,6 @@
+---
+"@livekit/protocol": minor
+"github.com/livekit/protocol": minor
+---
+
+Add disconnect reasons for SIP.
diff --git a/livekit/livekit_models.pb.go b/livekit/livekit_models.pb.go
index 6813e99b..ef973fd9 100644
--- a/livekit/livekit_models.pb.go
+++ b/livekit/livekit_models.pb.go
@@ -466,6 +466,10 @@ const (
 	DisconnectReason_SIGNAL_CLOSE DisconnectReason = 9
 	// the room was closed, due to all Standard and Ingress participants having left
 	DisconnectReason_ROOM_CLOSED DisconnectReason = 10
+	// SIP callee did not respond in time
+	DisconnectReason_USER_UNAVAILABLE DisconnectReason = 11
+	// SIP callee rejected the call (busy)
+	DisconnectReason_REJECTED_BY_USER DisconnectReason = 12
 )
 
 // Enum value maps for DisconnectReason.
@@ -482,6 +486,8 @@ var (
 		8:  "MIGRATION",
 		9:  "SIGNAL_CLOSE",
 		10: "ROOM_CLOSED",
+		11: "USER_UNAVAILABLE",
+		12: "REJECTED_BY_USER",
 	}
 	DisconnectReason_value = map[string]int32{
 		"UNKNOWN_REASON":      0,
@@ -495,6 +501,8 @@ var (
 		"MIGRATION":           8,
 		"SIGNAL_CLOSE":        9,
 		"ROOM_CLOSED":         10,
+		"USER_UNAVAILABLE":    11,
+		"REJECTED_BY_USER":    12,
 	}
 )
 
@@ -5090,8 +5098,8 @@ var file_livekit_models_proto_rawDesc = []byte{
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@@ -5105,37 +5113,40 @@ var file_livekit_models_proto_rawDesc = []byte{
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+	0x33,
 }
 
 var (
diff --git a/protobufs/livekit_models.proto b/protobufs/livekit_models.proto
index f1d39754..8e5e8090 100644
--- a/protobufs/livekit_models.proto
+++ b/protobufs/livekit_models.proto
@@ -443,6 +443,10 @@ enum DisconnectReason {
   SIGNAL_CLOSE = 9;
   // the room was closed, due to all Standard and Ingress participants having left
   ROOM_CLOSED = 10;
+  // SIP callee did not respond in time
+  USER_UNAVAILABLE = 11;
+  // SIP callee rejected the call (busy)
+  REJECTED_BY_USER = 12;
 }
 
 message RTPDrift {