diff --git a/crypto.js b/crypto.js
index e77955b..e043782 100644
--- a/crypto.js
+++ b/crypto.js
@@ -71,6 +71,17 @@ function hexToBuf(hex) {
 
 /* ─── QR compression: deflate-raw + base45 ─── */
 
+function stripSDP(sdp) {
+  return sdp.split('\r\n').map(line => {
+    if (!line.startsWith('a=candidate:')) return line;
+    const parts = line.split(' ');
+    if (parts[2] === 'tcp') return null;
+    if (parts[7] !== 'host') return null;
+    if (parts[4] && parts[4].includes(':')) return null;
+    return line;
+  }).filter(Boolean).join('\r\n');
+}
+
 async function pack(obj) {
   const json = JSON.stringify(obj);
   const blob = new Blob([json]);
diff --git a/p2p.js b/p2p.js
index 462c308..e227da5 100644
--- a/p2p.js
+++ b/p2p.js
@@ -43,7 +43,8 @@ class MeshNet {
       if (signalSent) return;
       signalSent = true;
 
-      const packed = await pack({ v: 1, id: this.myPeerId, s: signal });
+      const minSignal = signal.sdp ? { ...signal, sdp: stripSDP(signal.sdp) } : signal;
+      const packed = await pack({ v: 1, id: this.myPeerId, s: minSignal });
       this._currentQRData = encode45(packed);
       this._fullSDPData = this._currentQRData;
 
@@ -95,7 +96,8 @@ class MeshNet {
     peer.on('signal', async signal => {
       if (answerSent) return;
       answerSent = true;
-      const packed = await pack({ v: 1, id: this.myPeerId, s: signal, to: remoteId });
+      const minSignal = signal.sdp ? { ...signal, sdp: stripSDP(signal.sdp) } : signal;
+      const packed = await pack({ v: 1, id: this.myPeerId, s: minSignal, to: remoteId });
       const answerData = encode45(packed);
       if (this.onanswerready) this.onanswerready(answerData);
     });