diff --git a/components/dialer/CMakeLists.txt b/components/dialer/CMakeLists.txt
new file mode 100644
index 0000000..13e3259
--- /dev/null
+++ b/components/dialer/CMakeLists.txt
@@ -0,0 +1,5 @@
+idf_component_register(
+    SRCS "dialer.c"
+    INCLUDE_DIRS "include"
+    REQUIRES esp_timer
+)
diff --git a/components/dialer/dialer.c b/components/dialer/dialer.c
new file mode 100644
index 0000000..78cae95
--- /dev/null
+++ b/components/dialer/dialer.c
@@ -0,0 +1,82 @@
+/*
+ * dialer.c — Digit accumulator for the PLIP telephone state machine.
+ *
+ * Digits are pushed from two sources:
+ *   1. HTTP /debug/dial?number=NNNN  (net.c handler)
+ *   2. Rotary pulse detection (phone.c, CONFIG_PLIP_DIAL_PULSE)
+ *
+ * Thread-safety: all state is protected by atomic operations on s_last_us
+ * and simple writes to s_len / s_num (called from a single phone task or
+ * HTTP task at a time — no concurrent push expected).
+ */
+
+#include "dialer.h"
+
+#ifdef DIALER_HOST_TEST
+#include <stdint.h>
+static int64_t g_fake_us = 0;
+static int64_t esp_timer_get_time(void) { return g_fake_us; }
+void dialer_test_set_time_us(int64_t us);  /* déclaré pour le test */
+void dialer_test_set_time_us(int64_t us) { g_fake_us = us; }
+#define ESP_LOGI(tag, ...) ((void)0)
+#else
+#include "esp_timer.h"
+#include "esp_log.h"
+#endif
+
+#include <string.h>
+#include <stdint.h>
+
+#define TAG "dialer"
+
+#define MAX_DIGITS 12
+
+static char    s_num[MAX_DIGITS + 1];
+static int     s_len;
+static int64_t s_last_us;  /* esp_timer_get_time() at last push */
+
+void dialer_init(void)
+{
+    memset(s_num, 0, sizeof(s_num));
+    s_len     = 0;
+    s_last_us = 0;
+    ESP_LOGI(TAG, "dialer init");
+}
+
+void dialer_push_digit(int d)
+{
+    if (d < 0 || d > 9) return;
+    if (s_len >= MAX_DIGITS) return;  /* silently discard overflow */
+
+    s_num[s_len++] = (char)('0' + d);
+    s_num[s_len]   = '\0';
+    s_last_us      = esp_timer_get_time();
+
+    ESP_LOGI(TAG, "digit %d -> number so far: \"%s\"", d, s_num);
+}
+
+void dialer_reset(void)
+{
+    memset(s_num, 0, sizeof(s_num));
+    s_len     = 0;
+    s_last_us = 0;
+    ESP_LOGI(TAG, "dialer reset");
+}
+
+const char *dialer_current(void)
+{
+    return s_num;
+}
+
+bool dialer_idle(void)
+{
+    return s_len == 0;
+}
+
+int dialer_ms_since_last(void)
+{
+    if (s_last_us == 0) return 0;
+    int64_t elapsed_us = esp_timer_get_time() - s_last_us;
+    int ms = (int)(elapsed_us / 1000);
+    return (ms < 0) ? 0 : ms;
+}
diff --git a/components/dialer/include/dialer.h b/components/dialer/include/dialer.h
new file mode 100644
index 0000000..6483095
--- /dev/null
+++ b/components/dialer/include/dialer.h
@@ -0,0 +1,9 @@
+#pragma once
+#include <stdbool.h>
+
+void        dialer_init(void);
+void        dialer_push_digit(int d);
+void        dialer_reset(void);
+const char *dialer_current(void);
+bool        dialer_idle(void);
+int         dialer_ms_since_last(void);
diff --git a/components/dialer/test_dialer.c b/components/dialer/test_dialer.c
new file mode 100644
index 0000000..887bc99
--- /dev/null
+++ b/components/dialer/test_dialer.c
@@ -0,0 +1,35 @@
+#include "dialer.h"
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+
+void dialer_test_set_time_us(int64_t us);  /* fourni par dialer.c sous DIALER_HOST_TEST */
+
+int main(void)
+{
+    dialer_init();
+    assert(dialer_idle());                 /* vide au départ */
+
+    dialer_test_set_time_us(1000000);      /* t = 1 s */
+    dialer_push_digit(0);
+    dialer_push_digit(1);
+    dialer_push_digit(4);
+    assert(!dialer_idle());
+    assert(strcmp(dialer_current(), "014") == 0);
+
+    /* ms depuis le dernier chiffre */
+    dialer_test_set_time_us(1000000 + 1500000);  /* +1.5 s */
+    assert(dialer_ms_since_last() == 1500);
+
+    /* chiffres hors plage ignorés */
+    dialer_push_digit(-1);
+    dialer_push_digit(10);
+    assert(strcmp(dialer_current(), "014") == 0);
+
+    dialer_reset();
+    assert(dialer_idle());
+    assert(strcmp(dialer_current(), "") == 0);
+
+    printf("dialer: 6/6 assertions OK\n");
+    return 0;
+}
diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
index 78a59ce..b5c8f3b 100644
--- a/main/CMakeLists.txt
+++ b/main/CMakeLists.txt
@@ -1,5 +1,5 @@
 idf_component_register(
     SRCS "app_main.c"
     INCLUDE_DIRS "."
-    REQUIRES nvs_flash config_store hal_es8388 hal_i2s audio_router slic_ks0835
+    REQUIRES nvs_flash config_store hal_es8388 hal_i2s audio_router slic_ks0835 dialer
 )