diff --git a/api/audio/echo_canceller3_config.cc b/api/audio/echo_canceller3_config.cc
index 46c1eda..f040790 100644
--- a/api/audio/echo_canceller3_config.cc
+++ b/api/audio/echo_canceller3_config.cc
@@ -10,6 +10,7 @@
 #include "api/audio/echo_canceller3_config.h"
 
 #include <algorithm>
+#include <cmath>
 
 #include "rtc_base/logging.h"
 #include "rtc_base/numerics/safe_minmax.h"
@@ -18,6 +19,7 @@
 namespace {
 bool Limit(float* value, float min, float max) {
   float clamped = rtc::SafeClamp(*value, min, max);
+  clamped = std::isfinite(clamped) ? clamped : min;
   bool res = *value == clamped;
   *value = clamped;
   return res;
@@ -85,164 +87,161 @@
     c->delay.down_sampling_factor = 4;
     res = false;
   }
-
-  if (c->delay.num_filters == 0) {
-    c->delay.num_filters = 1;
-    res = false;
-  }
-  if (c->delay.api_call_jitter_blocks == 0) {
-    c->delay.api_call_jitter_blocks = 1;
-    res = false;
-  }
-
-  if (c->delay.api_call_jitter_blocks == 0) {
-    c->delay.api_call_jitter_blocks = 1;
-    res = false;
-  }
   if (c->delay.delay_headroom_blocks <= 1 &&
       c->delay.hysteresis_limit_1_blocks == 1) {
     c->delay.hysteresis_limit_1_blocks = 0;
     res = false;
   }
-  res = res && Limit(&c->delay.delay_estimate_smoothing, 0.f, 1.f);
-  res = res && Limit(&c->delay.delay_candidate_detection_threshold, 0.f, 1.f);
-  res = res && Limit(&c->delay.delay_selection_thresholds.initial, 1, 250);
-  res = res && Limit(&c->delay.delay_selection_thresholds.converged, 1, 250);
+  res = res & Limit(&c->delay.default_delay, 0, 5000);
+  res = res & Limit(&c->delay.num_filters, 0, 5000);
+  res = res & Limit(&c->delay.api_call_jitter_blocks, 1, 5000);
+  res = res & Limit(&c->delay.min_echo_path_delay_blocks, 0, 5000);
+  res = res & Limit(&c->delay.delay_headroom_blocks, 0, 5000);
+  res = res & Limit(&c->delay.hysteresis_limit_1_blocks, 0, 5000);
+  res = res & Limit(&c->delay.hysteresis_limit_2_blocks, 0, 5000);
+  res = res & Limit(&c->delay.skew_hysteresis_blocks, 0, 5000);
+  res = res & Limit(&c->delay.fixed_capture_delay_samples, 0, 5000);
+  res = res & Limit(&c->delay.delay_estimate_smoothing, 0.f, 1.f);
+  res = res & Limit(&c->delay.delay_candidate_detection_threshold, 0.f, 1.f);
+  res = res & Limit(&c->delay.delay_selection_thresholds.initial, 1, 250);
+  res = res & Limit(&c->delay.delay_selection_thresholds.converged, 1, 250);
 
-  res = res && Limit(&c->filter.main.length_blocks, 1, 50);
-  res = res && Limit(&c->filter.main.leakage_converged, 0.f, 1000.f);
-  res = res && Limit(&c->filter.main.leakage_diverged, 0.f, 1000.f);
-  res = res && Limit(&c->filter.main.error_floor, 0.f, 1000.f);
-  res = res && Limit(&c->filter.main.noise_gate, 0.f, 100000000.f);
+  res = res & Limit(&c->filter.main.length_blocks, 1, 50);
+  res = res & Limit(&c->filter.main.leakage_converged, 0.f, 1000.f);
+  res = res & Limit(&c->filter.main.leakage_diverged, 0.f, 1000.f);
+  res = res & Limit(&c->filter.main.error_floor, 0.f, 1000.f);
+  res = res & Limit(&c->filter.main.error_ceil, 0.f, 100000000.f);
+  res = res & Limit(&c->filter.main.noise_gate, 0.f, 100000000.f);
 
-  res = res && Limit(&c->filter.main_initial.length_blocks, 1, 50);
-  res = res && Limit(&c->filter.main_initial.leakage_converged, 0.f, 1000.f);
-  res = res && Limit(&c->filter.main_initial.leakage_diverged, 0.f, 1000.f);
-  res = res && Limit(&c->filter.main_initial.error_floor, 0.f, 1000.f);
-  res = res && Limit(&c->filter.main_initial.noise_gate, 0.f, 100000000.f);
+  res = res & Limit(&c->filter.main_initial.length_blocks, 1, 50);
+  res = res & Limit(&c->filter.main_initial.leakage_converged, 0.f, 1000.f);
+  res = res & Limit(&c->filter.main_initial.leakage_diverged, 0.f, 1000.f);
+  res = res & Limit(&c->filter.main_initial.error_floor, 0.f, 1000.f);
+  res = res & Limit(&c->filter.main_initial.error_ceil, 0.f, 100000000.f);
+  res = res & Limit(&c->filter.main_initial.noise_gate, 0.f, 100000000.f);
 
   if (c->filter.main.length_blocks < c->filter.main_initial.length_blocks) {
     c->filter.main_initial.length_blocks = c->filter.main.length_blocks;
     res = false;
   }
 
-  res = res && Limit(&c->filter.shadow.length_blocks, 1, 50);
-  res = res && Limit(&c->filter.shadow.rate, 0.f, 1.f);
-  res = res && Limit(&c->filter.shadow.noise_gate, 0.f, 100000000.f);
+  res = res & Limit(&c->filter.shadow.length_blocks, 1, 50);
+  res = res & Limit(&c->filter.shadow.rate, 0.f, 1.f);
+  res = res & Limit(&c->filter.shadow.noise_gate, 0.f, 100000000.f);
 
-  res = res && Limit(&c->filter.shadow_initial.length_blocks, 1, 50);
-  res = res && Limit(&c->filter.shadow_initial.rate, 0.f, 1.f);
-  res = res && Limit(&c->filter.shadow_initial.noise_gate, 0.f, 100000000.f);
+  res = res & Limit(&c->filter.shadow_initial.length_blocks, 1, 50);
+  res = res & Limit(&c->filter.shadow_initial.rate, 0.f, 1.f);
+  res = res & Limit(&c->filter.shadow_initial.noise_gate, 0.f, 100000000.f);
 
   if (c->filter.shadow.length_blocks < c->filter.shadow_initial.length_blocks) {
     c->filter.shadow_initial.length_blocks = c->filter.shadow.length_blocks;
     res = false;
   }
 
-  res = res && Limit(&c->filter.config_change_duration_blocks, 0, 100000);
-  res = res && Limit(&c->filter.initial_state_seconds, 0.f, 100.f);
+  res = res & Limit(&c->filter.config_change_duration_blocks, 0, 100000);
+  res = res & Limit(&c->filter.initial_state_seconds, 0.f, 100.f);
 
-  res = res && Limit(&c->erle.min, 1.f, 100000.f);
-  res = res && Limit(&c->erle.max_l, 1.f, 100000.f);
-  res = res && Limit(&c->erle.max_h, 1.f, 100000.f);
+  res = res & Limit(&c->erle.min, 1.f, 100000.f);
+  res = res & Limit(&c->erle.max_l, 1.f, 100000.f);
+  res = res & Limit(&c->erle.max_h, 1.f, 100000.f);
   if (c->erle.min > c->erle.max_l || c->erle.min > c->erle.max_h) {
     c->erle.min = std::min(c->erle.max_l, c->erle.max_h);
     res = false;
   }
 
-  res = res && Limit(&c->ep_strength.lf, 0.f, 1000000.f);
-  res = res && Limit(&c->ep_strength.mf, 0.f, 1000000.f);
-  res = res && Limit(&c->ep_strength.hf, 0.f, 1000000.f);
-  res = res && Limit(&c->ep_strength.default_len, 0.f, 1.f);
-
-  res = res &&
-        Limit(&c->echo_audibility.low_render_limit, 0.f, 32768.f * 32768.f);
-  res = res &&
-        Limit(&c->echo_audibility.normal_render_limit, 0.f, 32768.f * 32768.f);
-  res = res && Limit(&c->echo_audibility.floor_power, 0.f, 32768.f * 32768.f);
-  res = res && Limit(&c->echo_audibility.audibility_threshold_lf, 0.f,
-                     32768.f * 32768.f);
-  res = res && Limit(&c->echo_audibility.audibility_threshold_mf, 0.f,
-                     32768.f * 32768.f);
-  res = res && Limit(&c->echo_audibility.audibility_threshold_hf, 0.f,
-                     32768.f * 32768.f);
-
-  res = res &&
-        Limit(&c->render_levels.active_render_limit, 0.f, 32768.f * 32768.f);
-  res = res && Limit(&c->render_levels.poor_excitation_render_limit, 0.f,
-                     32768.f * 32768.f);
-  res = res && Limit(&c->render_levels.poor_excitation_render_limit_ds8, 0.f,
-                     32768.f * 32768.f);
+  res = res & Limit(&c->ep_strength.lf, 0.f, 1000000.f);
+  res = res & Limit(&c->ep_strength.mf, 0.f, 1000000.f);
+  res = res & Limit(&c->ep_strength.hf, 0.f, 1000000.f);
+  res = res & Limit(&c->ep_strength.default_len, 0.f, 1.f);
 
   res =
-      res && Limit(&c->echo_removal_control.gain_rampup.initial_gain, 0.f, 1.f);
-  res = res && Limit(&c->echo_removal_control.gain_rampup.first_non_zero_gain,
-                     0.f, 1.f);
-  res = res && Limit(&c->echo_removal_control.gain_rampup.non_zero_gain_blocks,
-                     0, 100000);
-  res = res &&
+      res & Limit(&c->echo_audibility.low_render_limit, 0.f, 32768.f * 32768.f);
+  res = res &
+        Limit(&c->echo_audibility.normal_render_limit, 0.f, 32768.f * 32768.f);
+  res = res & Limit(&c->echo_audibility.floor_power, 0.f, 32768.f * 32768.f);
+  res = res & Limit(&c->echo_audibility.audibility_threshold_lf, 0.f,
+                    32768.f * 32768.f);
+  res = res & Limit(&c->echo_audibility.audibility_threshold_mf, 0.f,
+                    32768.f * 32768.f);
+  res = res & Limit(&c->echo_audibility.audibility_threshold_hf, 0.f,
+                    32768.f * 32768.f);
+
+  res = res &
+        Limit(&c->render_levels.active_render_limit, 0.f, 32768.f * 32768.f);
+  res = res & Limit(&c->render_levels.poor_excitation_render_limit, 0.f,
+                    32768.f * 32768.f);
+  res = res & Limit(&c->render_levels.poor_excitation_render_limit_ds8, 0.f,
+                    32768.f * 32768.f);
+
+  res =
+      res & Limit(&c->echo_removal_control.gain_rampup.initial_gain, 0.f, 1.f);
+  res = res & Limit(&c->echo_removal_control.gain_rampup.first_non_zero_gain,
+                    0.f, 1.f);
+  res = res & Limit(&c->echo_removal_control.gain_rampup.non_zero_gain_blocks,
+                    0, 100000);
+  res = res &
         Limit(&c->echo_removal_control.gain_rampup.full_gain_blocks, 0, 100000);
 
-  res = res && Limit(&c->echo_model.noise_floor_hold, 0, 1000);
-  res = res && Limit(&c->echo_model.min_noise_floor_power, 0, 2000000.f);
-  res = res && Limit(&c->echo_model.stationary_gate_slope, 0, 1000000.f);
-  res = res && Limit(&c->echo_model.noise_gate_power, 0, 1000000.f);
-  res = res && Limit(&c->echo_model.noise_gate_slope, 0, 1000000.f);
-  res = res && Limit(&c->echo_model.render_pre_window_size, 0, 100);
-  res = res && Limit(&c->echo_model.render_post_window_size, 0, 100);
-  res = res && Limit(&c->echo_model.render_pre_window_size_init, 0, 100);
-  res = res && Limit(&c->echo_model.render_post_window_size_init, 0, 100);
-  res = res && Limit(&c->echo_model.nonlinear_hold, 0, 100);
-  res = res && Limit(&c->echo_model.nonlinear_release, 0, 1.f);
+  res = res & Limit(&c->echo_model.noise_floor_hold, 0, 1000);
+  res = res & Limit(&c->echo_model.min_noise_floor_power, 0, 2000000.f);
+  res = res & Limit(&c->echo_model.stationary_gate_slope, 0, 1000000.f);
+  res = res & Limit(&c->echo_model.noise_gate_power, 0, 1000000.f);
+  res = res & Limit(&c->echo_model.noise_gate_slope, 0, 1000000.f);
+  res = res & Limit(&c->echo_model.render_pre_window_size, 0, 100);
+  res = res & Limit(&c->echo_model.render_post_window_size, 0, 100);
+  res = res & Limit(&c->echo_model.render_pre_window_size_init, 0, 100);
+  res = res & Limit(&c->echo_model.render_post_window_size_init, 0, 100);
+  res = res & Limit(&c->echo_model.nonlinear_hold, 0, 100);
+  res = res & Limit(&c->echo_model.nonlinear_release, 0, 1.f);
 
-  res = res &&
+  res = res & Limit(&c->suppressor.nearend_average_blocks, 1, 5000);
+
+  res = res &
         Limit(&c->suppressor.normal_tuning.mask_lf.enr_transparent, 0.f, 100.f);
-  res = res &&
+  res = res &
         Limit(&c->suppressor.normal_tuning.mask_lf.enr_suppress, 0.f, 100.f);
-  res = res &&
+  res = res &
         Limit(&c->suppressor.normal_tuning.mask_lf.emr_transparent, 0.f, 100.f);
-  res = res &&
+  res = res &
         Limit(&c->suppressor.normal_tuning.mask_hf.enr_transparent, 0.f, 100.f);
-  res = res &&
+  res = res &
         Limit(&c->suppressor.normal_tuning.mask_hf.enr_suppress, 0.f, 100.f);
-  res = res &&
+  res = res &
         Limit(&c->suppressor.normal_tuning.mask_hf.emr_transparent, 0.f, 100.f);
-  res = res && Limit(&c->suppressor.normal_tuning.max_inc_factor, 0.f, 100.f);
-  res =
-      res && Limit(&c->suppressor.normal_tuning.max_dec_factor_lf, 0.f, 100.f);
+  res = res & Limit(&c->suppressor.normal_tuning.max_inc_factor, 0.f, 100.f);
+  res = res & Limit(&c->suppressor.normal_tuning.max_dec_factor_lf, 0.f, 100.f);
 
-  res = res && Limit(&c->suppressor.nearend_tuning.mask_lf.enr_transparent, 0.f,
-                     100.f);
-  res = res &&
+  res = res & Limit(&c->suppressor.nearend_tuning.mask_lf.enr_transparent, 0.f,
+                    100.f);
+  res = res &
         Limit(&c->suppressor.nearend_tuning.mask_lf.enr_suppress, 0.f, 100.f);
-  res = res && Limit(&c->suppressor.nearend_tuning.mask_lf.emr_transparent, 0.f,
-                     100.f);
-  res = res && Limit(&c->suppressor.nearend_tuning.mask_hf.enr_transparent, 0.f,
-                     100.f);
-  res = res &&
+  res = res & Limit(&c->suppressor.nearend_tuning.mask_lf.emr_transparent, 0.f,
+                    100.f);
+  res = res & Limit(&c->suppressor.nearend_tuning.mask_hf.enr_transparent, 0.f,
+                    100.f);
+  res = res &
         Limit(&c->suppressor.nearend_tuning.mask_hf.enr_suppress, 0.f, 100.f);
-  res = res && Limit(&c->suppressor.nearend_tuning.mask_hf.emr_transparent, 0.f,
-                     100.f);
-  res = res && Limit(&c->suppressor.nearend_tuning.max_inc_factor, 0.f, 100.f);
+  res = res & Limit(&c->suppressor.nearend_tuning.mask_hf.emr_transparent, 0.f,
+                    100.f);
+  res = res & Limit(&c->suppressor.nearend_tuning.max_inc_factor, 0.f, 100.f);
   res =
-      res && Limit(&c->suppressor.nearend_tuning.max_dec_factor_lf, 0.f, 100.f);
+      res & Limit(&c->suppressor.nearend_tuning.max_dec_factor_lf, 0.f, 100.f);
 
-  res = res && Limit(&c->suppressor.dominant_nearend_detection.enr_threshold,
-                     0.f, 1000000.f);
-  res = res && Limit(&c->suppressor.dominant_nearend_detection.snr_threshold,
-                     0.f, 1000000.f);
-  res = res && Limit(&c->suppressor.dominant_nearend_detection.hold_duration, 0,
-                     10000);
-  res =
-      res && Limit(&c->suppressor.dominant_nearend_detection.trigger_threshold,
-                   0, 10000);
+  res = res & Limit(&c->suppressor.dominant_nearend_detection.enr_threshold,
+                    0.f, 1000000.f);
+  res = res & Limit(&c->suppressor.dominant_nearend_detection.snr_threshold,
+                    0.f, 1000000.f);
+  res = res & Limit(&c->suppressor.dominant_nearend_detection.hold_duration, 0,
+                    10000);
+  res = res & Limit(&c->suppressor.dominant_nearend_detection.trigger_threshold,
+                    0, 10000);
 
-  res = res && Limit(&c->suppressor.high_bands_suppression.enr_threshold, 0.f,
-                     1000000.f);
-  res = res && Limit(&c->suppressor.high_bands_suppression.max_gain_during_echo,
-                     0.f, 1.f);
+  res = res & Limit(&c->suppressor.high_bands_suppression.enr_threshold, 0.f,
+                    1000000.f);
+  res = res & Limit(&c->suppressor.high_bands_suppression.max_gain_during_echo,
+                    0.f, 1.f);
 
-  res = res && Limit(&c->suppressor.floor_first_increase, 0.f, 1000000.f);
+  res = res & Limit(&c->suppressor.floor_first_increase, 0.f, 1000000.f);
 
   return res;
 }
diff --git a/api/audio/echo_canceller3_config.h b/api/audio/echo_canceller3_config.h
index 5bb5ece..5eb2fd2 100644
--- a/api/audio/echo_canceller3_config.h
+++ b/api/audio/echo_canceller3_config.h
@@ -19,7 +19,7 @@
 
 // Configuration struct for EchoCanceller3
 struct RTC_EXPORT EchoCanceller3Config {
-  // Checks and updates the parameters in a config to lie within reasonable
+  // Checks and updates the config parameters to lie within (mostly) reasonable
   // ranges. Returns true if and only of the config did not need to be changed.
   static bool Validate(EchoCanceller3Config* config);
 
diff --git a/api/audio/echo_canceller3_config_json.cc b/api/audio/echo_canceller3_config_json.cc
index 2b6a329..bb44162 100644
--- a/api/audio/echo_canceller3_config_json.cc
+++ b/api/audio/echo_canceller3_config_json.cc
@@ -30,6 +30,7 @@
   RTC_DCHECK(param);
   int v;
   if (rtc::GetIntFromJsonObject(root, param_name, &v)) {
+    RTC_DCHECK_GE(v, 0);
     *param = v;
   }
 }
@@ -216,7 +217,7 @@
               &cfg.echo_audibility.audibility_threshold_hf);
     ReadParam(section, "use_stationary_properties",
               &cfg.echo_audibility.use_stationary_properties);
-    ReadParam(section, "use_stationary_properties_at_init",
+    ReadParam(section, "use_stationarity_properties_at_init",
               &cfg.echo_audibility.use_stationarity_properties_at_init);
   }
 
diff --git a/api/audio/test/echo_canceller3_config_json_unittest.cc b/api/audio/test/echo_canceller3_config_json_unittest.cc
index 7c3a445..16967fc 100644
--- a/api/audio/test/echo_canceller3_config_json_unittest.cc
+++ b/api/audio/test/echo_canceller3_config_json_unittest.cc
@@ -8,34 +8,62 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "api/audio/echo_canceller3_config_json.h"
+#include <array>
+#include <cstring>
+
 #include "api/audio/echo_canceller3_config.h"
+#include "api/audio/echo_canceller3_config_json.h"
+#include "rtc_base/random.h"
 #include "test/gtest.h"
 
 namespace webrtc {
+namespace {
+EchoCanceller3Config GenerateRandomConfig(Random* prng) {
+  std::array<uint8_t, sizeof(EchoCanceller3Config)> random_bytes;
+  for (uint8_t& byte : random_bytes) {
+    byte = prng->Rand<uint8_t>();
+  }
+  auto* config = reinterpret_cast<EchoCanceller3Config*>(random_bytes.data());
+  EchoCanceller3Config::Validate(config);
+  return *config;
+}
+}  // namespace
 
 TEST(EchoCanceller3JsonHelpers, ToStringAndParseJson) {
-  EchoCanceller3Config cfg;
-  cfg.delay.down_sampling_factor = 1u;
-  cfg.filter.shadow_initial.length_blocks = 7u;
-  cfg.suppressor.normal_tuning.mask_hf.enr_suppress = .5f;
-  std::string json_string = Aec3ConfigToJsonString(cfg);
-  EchoCanceller3Config cfg_transformed = Aec3ConfigFromJsonString(json_string);
+  Random prng(7297352569823ull);
+  for (int i = 0; i < 10; ++i) {
+    EchoCanceller3Config cfg = GenerateRandomConfig(&prng);
+    std::string json_string = Aec3ConfigToJsonString(cfg);
+    EchoCanceller3Config cfg_transformed =
+        Aec3ConfigFromJsonString(json_string);
 
-  // Expect unchanged values to remain default.
-  EXPECT_EQ(cfg.filter.main.error_floor,
-            cfg_transformed.filter.main.error_floor);
-  EXPECT_EQ(cfg.ep_strength.default_len,
-            cfg_transformed.ep_strength.default_len);
-  EXPECT_EQ(cfg.suppressor.normal_tuning.mask_lf.enr_suppress,
-            cfg_transformed.suppressor.normal_tuning.mask_lf.enr_suppress);
+    // Expect an arbitrary subset of values to carry through the transformation.
+    constexpr float kEpsilon = 1e-4;
+    EXPECT_NEAR(cfg.filter.main.error_floor,
+                cfg_transformed.filter.main.error_floor, kEpsilon);
+    EXPECT_NEAR(cfg.ep_strength.default_len,
+                cfg_transformed.ep_strength.default_len, kEpsilon);
+    EXPECT_NEAR(cfg.suppressor.normal_tuning.mask_lf.enr_suppress,
+                cfg_transformed.suppressor.normal_tuning.mask_lf.enr_suppress,
+                kEpsilon);
+    EXPECT_EQ(cfg.delay.down_sampling_factor,
+              cfg_transformed.delay.down_sampling_factor);
+    EXPECT_EQ(cfg.filter.shadow_initial.length_blocks,
+              cfg_transformed.filter.shadow_initial.length_blocks);
+    EXPECT_NEAR(cfg.suppressor.normal_tuning.mask_hf.enr_suppress,
+                cfg_transformed.suppressor.normal_tuning.mask_hf.enr_suppress,
+                kEpsilon);
+  }
+}
 
-  // Expect changed values to carry through the transformation.
-  EXPECT_EQ(cfg.delay.down_sampling_factor,
-            cfg_transformed.delay.down_sampling_factor);
-  EXPECT_EQ(cfg.filter.shadow_initial.length_blocks,
-            cfg_transformed.filter.shadow_initial.length_blocks);
-  EXPECT_EQ(cfg.suppressor.normal_tuning.mask_hf.enr_suppress,
-            cfg_transformed.suppressor.normal_tuning.mask_hf.enr_suppress);
+TEST(EchoCanceller3JsonHelpers, IteratedToStringGivesIdenticalStrings) {
+  Random prng(7297352569824ull);
+  for (int i = 0; i < 10; ++i) {
+    EchoCanceller3Config config = GenerateRandomConfig(&prng);
+    std::string json = Aec3ConfigToJsonString(config);
+    std::string iterated_json =
+        Aec3ConfigToJsonString(Aec3ConfigFromJsonString(json));
+    EXPECT_EQ(json, iterated_json);
+  }
 }
 }  // namespace webrtc