diff --git a/Cargo.toml b/Cargo.toml
index 25750e76..3d90b174 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,7 +36,6 @@ tokio-rustls = { version = "0.26.4", optional = true }
 rustls-pemfile = { version = "2.2.0", optional = true }
 rustls = "0.23.35"
 clap = { version = "4.5.47", features = ["derive"] }
-http = "1.3.1"
 nom = "8.0.0"
 
 [features]
@@ -60,6 +59,7 @@ stun-rs = "0.1.11"
 axum = { version = "0.8.6", features = ["ws"] }
 tower = "0.5.2"
 tower-http = { version = "0.6.6", features = ["fs", "cors"] }
+http = "1.3.1"
 
 [[example]]
 name = "client"
diff --git a/src/dialog/dialog.rs b/src/dialog/dialog.rs
index 3149eb57..4964f8c6 100644
--- a/src/dialog/dialog.rs
+++ b/src/dialog/dialog.rs
@@ -815,6 +815,10 @@ impl DialogInner {
                 );
                 return Ok(());
             }
+            (DialogState::Confirmed(_, _), DialogState::WaitAck(_, _)) => {
+                warn!("dialog already confirmed, ignoring transition to {}", state);
+                return Ok(());
+            }
             _ => {}
         }
         debug!("transitioning state: {} -> {}", old_state, state);