diff --git a/src/chat/chat_core.c b/src/chat/chat_core.c
index f1290b88..8f5946ff 100644
--- a/src/chat/chat_core.c
+++ b/src/chat/chat_core.c
@@ -15,6 +15,7 @@
 #include "chat_setting.h"
 #include "chat_member.h"
 #include "member_sync.h"
+#include "chat_sync.h"
 
 #include "../utun_instance.h"
 #include "../ntp_time.h"
@@ -259,6 +260,34 @@ void chat_core_set_setting_trampoline(void* arg) {
     u_free(arg);
 }
 
+/* ─── per-channel «play sound on new message» ─── */
+
+int chat_core_get_sound_on_message(struct UTUN_INSTANCE* inst, const char* ch_id) {
+    struct chat_core_ctx* cc = CC(inst);
+    if (!cc || !cc->initialized || !ch_id || !ch_id[0]) return 1;
+    char key[128]; snprintf(key, sizeof(key), "ch_%s_sound_on_message", ch_id);
+    sqlite3_stmt* st = NULL;
+    if (sqlite3_prepare_v2(cc->db, "SELECT value FROM ui_state WHERE key=?", -1, &st, NULL) != SQLITE_OK) return 1;
+    sqlite3_bind_text(st, 1, key, -1, SQLITE_STATIC);
+    int on = 1;
+    if (sqlite3_step(st) == SQLITE_ROW) {
+        const char* v = (const char*)sqlite3_column_text(st, 0);
+        if (v) on = atoi(v) != 0;
+    }
+    sqlite3_finalize(st);
+    return on;
+}
+
+void chat_core_set_sound_on_message(struct UTUN_INSTANCE* inst, const char* ch_id, int on) {
+    struct chat_core_ctx* cc = CC(inst);
+    if (!cc || !cc->initialized || !ch_id || !ch_id[0]) return;
+    char key[128]; snprintf(key, sizeof(key), "ch_%s_sound_on_message", ch_id);
+    char val[2]; snprintf(val, sizeof(val), "%d", on ? 1 : 0);
+    chat_core_save_ui_state(inst, key, val);
+    DEBUG_INFO(DEBUG_CATEGORY_CHAT_SYNC, "%s: sound_on_message ch=%s = %d", CC_ID, ch_id, on ? 1 : 0);
+    chat_sync_broadcast_sound_setting(inst, ch_id, on ? 1 : 0);
+}
+
 /* ─── headless API ─── */
 
 static void json_escape(const char* src, char* dst, size_t dst_sz) {
diff --git a/src/chat/chat_core.h b/src/chat/chat_core.h
index 50938cbe..96abd5b1 100644
--- a/src/chat/chat_core.h
+++ b/src/chat/chat_core.h
@@ -120,6 +120,11 @@ void chat_core_update_my_member(struct UTUN_INSTANCE* inst);
 /* Сохранение key-value в ui_state (вызывается из uasync-потока) */
 void chat_core_save_ui_state(struct UTUN_INSTANCE* inst, const char* key, const char* value);
 
+/* Per-channel «play sound on new message» (ui_state: ch_<id>_sound_on_message, default 1=on).
+ * set — сохраняет и рассылает пирам через chat_sync (троттлинг db_sync на сервере). */
+int  chat_core_get_sound_on_message(struct UTUN_INSTANCE* inst, const char* ch_id);
+void chat_core_set_sound_on_message(struct UTUN_INSTANCE* inst, const char* ch_id, int on);
+
 struct save_ui_state_arg { struct UTUN_INSTANCE* inst; char data[256]; };
 void chat_core_save_ui_state_trampoline(void* arg);
 
diff --git a/src/chat/chat_sync.c b/src/chat/chat_sync.c
index 31957657..d9b5b0d3 100644
--- a/src/chat/chat_sync.c
+++ b/src/chat/chat_sync.c
@@ -99,6 +99,7 @@ static const char* cs_msg_name(uint8_t type) {
     case CS_MSG_JOIN_INFO_RESP:     return "JOIN_INFO_RESP";
     case CS_MSG_JOIN_REQUEST:       return "JOIN_REQUEST";
     case CS_MSG_JOIN_READY:         return "JOIN_READY";
+    case CS_MSG_SOUND_SETTING:      return "SOUND_SETTING";
     default:                        return "???";
     }
 }
@@ -239,6 +240,10 @@ static void chat_sync_recv_cb(struct ETCP_CONN* conn, struct ll_entry* entry) {
         break;
     }
     case CS_MSG_CHANNEL_INVITE:   cs_handle_channel_invite(cs, peer, ch_id, pl, plen); break;
+    case CS_MSG_SOUND_SETTING:
+        if (plen >= 1)
+            db_sync_set_peer_sound(cs->inst, group_id, peer, pl[0] ? 1 : 0);
+        break;
     default:                      DEBUG_WARN(DEBUG_CATEGORY_MEMBER_SYNC, "%s: UNKNOWN msg type=%02x from=%016llx", CS_ID, type, (unsigned long long)peer); break;
     }
     u_free(entry->dgram); queue_entry_free(entry);
@@ -408,6 +413,35 @@ static void cs_on_peer_sleep(struct UTUN_INSTANCE* inst, uint64_t peer_node_id,
     }
 }
 
+/* ── Per-chat «play sound on message» (троттлинг db_sync на сервере) ── */
+
+static void cs_send_sound_setting(struct chat_sync* cs, const char* ch_id, uint64_t dst, int on) {
+    uint8_t p[2] = { CS_MSG_SOUND_SETTING, (uint8_t)(on ? 1 : 0) };
+    cs_send(cs, ch_id, dst, p, sizeof(p));
+}
+
+void chat_sync_broadcast_sound_setting(struct UTUN_INSTANCE* inst, const char* ch_id, int on) {
+    struct chat_sync* cs = cs_of(inst);
+    if (!cs || !cs->initialized || !ch_id || !ch_id[0]) return;
+    for (int i = 0; i < cs->channel_count; i++) {
+        if (strcmp(cs->channels[i].channel_id, ch_id) != 0) continue;
+        for (int j = 0; j < cs->channels[i].peer_count; j++) {
+            uint64_t pid = cs->channels[i].peer_ids[j];
+            if (pid == inst->node_id || !cs_is_peer_online(inst, pid)) continue;
+            cs_send_sound_setting(cs, ch_id, pid, on);
+        }
+        break;
+    }
+}
+
+/* На поднятии соединения: отправить пиру свои per-chat настройки звука (начальная синхронизация). */
+static void cs_send_all_sound_settings(struct chat_sync* cs, uint64_t peer) {
+    for (int i = 0; i < cs->channel_count; i++) {
+        int on = chat_core_get_sound_on_message(cs->inst, cs->channels[i].channel_id);
+        cs_send_sound_setting(cs, cs->channels[i].channel_id, peer, on);
+    }
+}
+
 /* ── Peer status change (GUI + online-бар + schedule_sync; онлайн в БД не хранится) ── */
 
 static void cs_on_peer_status_changed(struct chat_sync* cs, uint64_t peer, int online) {
@@ -536,6 +570,7 @@ static void cs_on_conn_up(struct ETCP_CONN* conn, int event, void* arg) { (void)
     }
 
     cs_on_peer_status_changed(cs, peer, 1);
+    cs_send_all_sound_settings(cs, peer);
 }
 
 static void cs_on_conn_down(struct ETCP_CONN* conn, int event, void* arg) { (void)event;
diff --git a/src/chat/chat_sync.h b/src/chat/chat_sync.h
index 89b77a3c..3851340f 100644
--- a/src/chat/chat_sync.h
+++ b/src/chat/chat_sync.h
@@ -51,6 +51,7 @@ struct UASYNC;
 #define CS_MSG_JOIN_INFO_RESP   0x11  /* connection → joiner: channel info + connection's member record */
 #define CS_MSG_JOIN_REQUEST     0x12  /* joiner → connection: {join_key:8, member...} */
 #define CS_MSG_JOIN_READY       0x13  /* connection → joiner: {group_id:8} */
+#define CS_MSG_SOUND_SETTING    0x14  /* peer → server: {sound_on:1} — per-chat play sound on message */
 
 /* Protocol constants */
 #define CS_SEND_DATA_MAX     32
@@ -114,6 +115,9 @@ void chat_sync_retry_channels_on_socket_change(struct UTUN_INSTANCE* inst);
  * чтобы cs_on_conn_status не запускал member_sync для удалённого ns до следующего refresh. */
 void chat_sync_on_channel_deleted(struct UTUN_INSTANCE* inst, const char* ch_id);
 
+/* Разослать всем подключённым пирам канала смену per-chat настройки «play sound on message». */
+void chat_sync_broadcast_sound_setting(struct UTUN_INSTANCE* inst, const char* ch_id, int on);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/chat/db_sync.c b/src/chat/db_sync.c
index 5ca3f5ea..90e6c4fe 100644
--- a/src/chat/db_sync.c
+++ b/src/chat/db_sync.c
@@ -51,6 +51,7 @@ struct SI_PEER {
     uint8_t  sync_state;
     uint64_t sync_start_tb;
     uint32_t retry_count;
+    uint8_t  sound_on;   /* 1 = пиру важен этот чат (play sound on message), не троттлим */
 };
 
 struct DB_SYNC_INSTANCE {
@@ -311,6 +312,7 @@ static struct SI_PEER* si_peer_add(struct DB_SYNC_INSTANCE* si, uint64_t node_id
     p = &si->peers[si->peer_count++];
     memset(p, 0, sizeof(*p));
     p->node_id = node_id;
+    p->sound_on = 1;
     return p;
 }
 
@@ -1475,6 +1477,22 @@ void db_sync_peer_set_state(struct DB_SYNC_INSTANCE* si, uint64_t node_id, uint8
     if (p) p->sync_state = state;
 }
 
+// Задать per-(chat,peer) флаг «play sound on message» (троттлинг: sound_off + спящий пир → пропуск).
+void db_sync_set_peer_sound(struct UTUN_INSTANCE* inst, uint64_t group_id, uint64_t peer_node_id, int sound_on)
+{
+    if (!inst || !inst->db_sync) return;
+    struct DB_SYNC* db = inst->db_sync;
+    struct DB_SYNC_INSTANCE* si = db_instance_find(db, group_id);
+    if (!si) return;   /* чат ещё не создан у нас — настройка не критична */
+    struct SI_PEER* p = si_peer_add(si, peer_node_id);
+    if (p && p->sound_on != (uint8_t)(sound_on ? 1 : 0)) {
+        p->sound_on = sound_on ? 1 : 0;
+        DEBUG_INFO(DEBUG_CATEGORY_CHAT_SYNC, "sync [%s] peer=%016llx sound_on=%d (throttle=%s)",
+                   SI_SHRT(si), (unsigned long long)peer_node_id, p->sound_on,
+                   p->sound_on ? "off" : "on");
+    }
+}
+
 // Гейт авто-синхронизации: пока gated — инстанс не запускает sync автоматически
 // (ждёт member_sync/pubkeys). При снятии гейта запускает sync к пирам в sync_state==0.
 void db_sync_instance_set_gated(struct DB_SYNC_INSTANCE* si, int gated)
@@ -1552,6 +1570,15 @@ static void db_sync_resume_peer_check(struct DB_SYNC* db)
 // Периодическая проверка: запускает синхронизацию для пиров в состоянии sync_state==0,
 // детектирует таймауты синхронизации (DB_SYNC_SYNC_TIMEOUT секунд), логирует зависшие.
 // Work-driven: перевзводится только пока есть пиры с sync_state != 2.
+
+/* Троттлинг: пир в SLEEP-фазе И чат для него «тихий» (sound_on=0) — пропускаем. */
+static int db_sync_peer_throttled(struct DB_SYNC* db, struct SI_PEER* p) {
+    if (!db || !p) return 0;
+    if (p->sound_on) return 0;   /* чат пиру важен (play sound) — не троттлим */
+    struct ETCP_CONN* conn = instance_find_conn(db->inst, p->node_id);
+    return conn && conn->peer_sleep_phase;
+}
+
 static void db_sync_peer_check_cb(void* arg)
 {
     struct DB_SYNC* db = (struct DB_SYNC*)arg;
@@ -1591,6 +1618,7 @@ static void db_sync_peer_check_cb(void* arg)
             uint32_t min_pos = UINT32_MAX;
             for (int j = 0; j < si->peer_count; j++) {
                 if (si->peers[j].sync_state == 0 && si->peers[j].synced_pos < min_pos) {
+                    if (db_sync_peer_throttled(db, &si->peers[j])) continue;   /* спящий пир в «тихом» чате — пропускаем */
                     min_pos = si->peers[j].synced_pos;
                     best = &si->peers[j];
                 }
diff --git a/src/chat/db_sync.h b/src/chat/db_sync.h
index 7abcbaef..d25213da 100644
--- a/src/chat/db_sync.h
+++ b/src/chat/db_sync.h
@@ -138,6 +138,9 @@ int      db_sync_chain_verify(struct DB_SYNC_INSTANCE* si);
 // Peer state control (for testing — disable PUSH to isolate sync protocol)
 void db_sync_peer_set_state(struct DB_SYNC_INSTANCE* si, uint64_t node_id, uint8_t state);
 
+// Per-(chat,peer) «play sound on message» flag: sound_off + sleeping peer → throttled.
+void db_sync_set_peer_sound(struct UTUN_INSTANCE* inst, uint64_t group_id, uint64_t peer_node_id, int sound_on);
+
 // Gate auto-sync: while gated the instance does not auto-initiate sync (waits for
 // member_sync/pubkeys). Un-gating launches sync to peers in sync_state==0.
 void db_sync_instance_set_gated(struct DB_SYNC_INSTANCE* si, int gated);
diff --git a/src/chat/merkle_sync.c b/src/chat/merkle_sync.c
index 9805a038..4cca95f3 100644
--- a/src/chat/merkle_sync.c
+++ b/src/chat/merkle_sync.c
@@ -692,12 +692,6 @@ static void _recv_cb(struct ETCP_CONN* conn, struct ll_entry* entry) {
     struct merkle_sync* ms = inst ? inst->msync : NULL;
     if (!ms || !ms->initialized) { u_free(entry->dgram); queue_entry_free(entry); return; }
     uint64_t peer = conn ? conn->peer_node_id : 0;
-
-    /* пир в спячке — не обрабатываем его синхронизацию (server-side throttling) */
-    if (conn && conn->peer_sleeping) {
-        DEBUG_DEBUG(DEBUG_CATEGORY_MEMBER_SYNC, "%s: recv DROP — peer=0x%016llx sleeping", MS_ID, (unsigned long long)peer);
-        u_free(entry->dgram); queue_entry_free(entry); return;
-    }
     const uint8_t* d = entry->dgram;
     size_t dlen = entry->len;
 
@@ -888,10 +882,10 @@ int merkle_sync_start(struct UTUN_INSTANCE* inst, uint64_t peer,
     if (!inst || !ns || !ms || !ms->initialized) return -1;
     _ensure_table(ms);
 
-    /* пир в спячке — не инициируем синхронизацию (server-side throttling) */
+    /* пир в SLEEP-фазе — не инициируем синхронизацию (server-side throttling) */
     {
         struct ETCP_CONN* pc = ms_find_conn_for_node(inst, peer);
-        if (pc && pc->peer_sleeping) {
+        if (pc && pc->peer_sleep_phase) {
             DEBUG_DEBUG(DEBUG_CATEGORY_MEMBER_SYNC, "%s: start SKIP — peer=0x%016llx sleeping", MS_ID, (unsigned long long)peer);
             return 0;
         }