diff --git a/src/providers/sip-provider.tsx b/src/providers/sip-provider.tsx
index dcc9bf5..eb1d874 100644
--- a/src/providers/sip-provider.tsx
+++ b/src/providers/sip-provider.tsx
@@ -125,14 +125,14 @@ export const SipProvider = ({ children }: PropsWithChildren) => {
             }
         };
 
-        const handleUnload = () => disconnectSip();
+        const handleUnload = () => disconnectSip(true);
 
         window.addEventListener('beforeunload', handleBeforeUnload);
         window.addEventListener('unload', handleUnload);
         return () => {
             window.removeEventListener('beforeunload', handleBeforeUnload);
             window.removeEventListener('unload', handleUnload);
-            disconnectSip();
+            disconnectSip(true); // force — component is unmounting
         };
     }, []); // empty deps — runs once on mount, cleanup only on unmount
 
diff --git a/src/state/sip-manager.ts b/src/state/sip-manager.ts
index be2438c..0edc9eb 100644
--- a/src/state/sip-manager.ts
+++ b/src/state/sip-manager.ts
@@ -81,8 +81,16 @@ export function connectSip(config: SIPConfig): void {
     sipClient.connect();
 }
 
-export function disconnectSip(): void {
-    console.log('[SIP-MGR] Disconnecting SIP');
+export function disconnectSip(force = false): void {
+    // Guard: don't disconnect SIP during an active or pending call
+    // unless explicitly forced (e.g., logout, page unload).
+    // This prevents React re-render cycles from killing the
+    // SIP WebSocket mid-dial.
+    if (!force && (outboundPending || outboundActive)) {
+        console.log('[SIP-MGR] Disconnect blocked — call in progress');
+        return;
+    }
+    console.log('[SIP-MGR] Disconnecting SIP' + (force ? ' (forced)' : ''));
     sipClient?.disconnect();
     sipClient = null;
     connected = false;