diff --git a/src/call/call_video.c b/src/call/call_video.c
index 4ccbdd2b..686d50e6 100644
--- a/src/call/call_video.c
+++ b/src/call/call_video.c
@@ -119,6 +119,11 @@ unsigned call_video_dpb_limit(int codec, unsigned level, unsigned width, unsigne
     unsigned frames = dpb_mbs[l - avc_levels] / (((width + 15) / 16) * ((height + 15) / 16));
     return frames < 16 ? frames : 16;
 }
+int call_video_hrd_valid(int codec, unsigned level, int nal, uint64_t bitrate, uint64_t cpb) {
+    const struct video_level *l = level <= 255 ? level_find(codec, level) : NULL;
+    unsigned factor = nal ? (codec == CALL_VIDEO_H264 ? 1200 : 1100) : 1000;
+    return l && bitrate && cpb && bitrate <= (uint64_t)l->kbps * factor && cpb <= (uint64_t)l->cpb_kbits * factor;
+}
 int call_video_format_supported(const struct call_video_caps *sender, const struct call_video_caps *receiver,
                                 const struct call_video_format *f) {
     return call_video_caps_valid(sender) && call_video_caps_valid(receiver) && call_video_format_valid(f)
diff --git a/src/call/call_video.h b/src/call/call_video.h
index 29a0ff4c..44bc61f6 100644
--- a/src/call/call_video.h
+++ b/src/call/call_video.h
@@ -64,6 +64,7 @@ int call_video_format_supported(const struct call_video_caps *sender, const stru
 int call_video_format_valid(const struct call_video_format *format);
 /* Нормативный предел DPB в кадрах по coded geometry и level; 0 при неверном уровне. */
 unsigned call_video_dpb_limit(int codec, unsigned level, unsigned width, unsigned height);
+int call_video_hrd_valid(int codec, unsigned level, int nal, uint64_t bitrate, uint64_t cpb);
 int call_video_same_format(const struct call_video_format *a, const struct call_video_format *b);
 int call_video_caps_encode(const struct call_video_caps *caps, uint8_t out[CALL_VIDEO_CAPS_BYTES]);
 int call_video_caps_parse(const uint8_t *data, size_t length, struct call_video_caps *out);