feat(sip): make rtp_timeout_hold configurable in Web UI and default to 0 (unlimited hold)

public/index.php

@@ -2554,7 +2554,7 @@ $isDevEnv = file_exists(__DIR__ . '/../.dev')
                                 </div>
                             </div>
 
-                            <div class="grid grid-cols-1 md:grid-cols-2 gap-4 pt-2">
+                            <div class="grid grid-cols-1 md:grid-cols-3 gap-4 pt-2">
                                 <div>
                                     <label class="block text-xs font-semibold text-slate-200 mb-1">RTP Keepalive (secondes)</label>
                                     <input type="number" id="sip-rtp-keepalive" name="rtp_keepalive" value="15" min="0" max="120"
@@ -2567,6 +2567,12 @@ $isDevEnv = file_exists(__DIR__ . '/../.dev')
                                         class="w-full px-3 py-2 rounded-xl bg-anthracite-950 border border-anthracite-700 text-xs text-white font-mono focus:ring-2 focus:ring-emerald-500 focus:outline-none">
                                     <p class="text-[11px] text-slate-400 mt-1">Durée avant coupure si aucun flux voix n'est reçu (raccroché distant brutal).</p>
                                 </div>
+                                <div>
+                                    <label class="block text-xs font-semibold text-slate-200 mb-1">RTP Timeout Mise en attente</label>
+                                    <input type="number" id="sip-rtp-timeout-hold" name="rtp_timeout_hold" value="0" min="0" max="3600"
+                                        class="w-full px-3 py-2 rounded-xl bg-anthracite-950 border border-anthracite-700 text-xs text-white font-mono focus:ring-2 focus:ring-emerald-500 focus:outline-none">
+                                    <p class="text-[11px] text-slate-400 mt-1">Délai max d'un appel en attente sans flux RTP (0 = illimité / désactivé).</p>
+                                </div>
                             </div>
                         </div>