diff --git a/daemon/call.c b/daemon/call.c
index bdb5904e2..ee6e22043 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -2759,6 +2759,8 @@ static void __call_monologue_init_from_flags(struct call_monologue *ml, struct c
 
 	call->last_signal_us = rtpe_now;
 	call->deleted_us = 0;
+	if (flags->force_strip_extmap)
+		CALL_SET(call, FORCE_STRIP_EXTMAP);
 	call->media_rec_slots = (flags->media_rec_slots > 0 && call->media_rec_slots == 0)
 								? flags->media_rec_slots
 								: call->media_rec_slots;
diff --git a/daemon/call_flags.c b/daemon/call_flags.c
index 0246731d1..1bda1580d 100644
--- a/daemon/call_flags.c
+++ b/daemon/call_flags.c
@@ -976,6 +976,10 @@ const char *call_ng_flags_flags(str *s, unsigned int idx, helper_arg arg) {
 		case CSH_LOOKUP("strip-extmap"):
 		case CSH_LOOKUP("strip extmap"):
 			return call_ng_flags_str_ht(STR_PTR("all"), 0, &out->rtpext_strip);
+		case CSH_LOOKUP("force-strip-extmap"):
+		case CSH_LOOKUP("force strip extmap"):
+			out->force_strip_extmap = true;
+			break;
 		case CSH_LOOKUP("symmetric-codecs"):
 		case CSH_LOOKUP("symmetric codecs"):
 			ilog(LOG_INFO, "Ignoring obsolete flag `symmetric-codecs`");
diff --git a/daemon/media_socket.c b/daemon/media_socket.c
index 37feaea76..89d3cd301 100644
--- a/daemon/media_socket.c
+++ b/daemon/media_socket.c
@@ -2545,7 +2545,10 @@ static void __determine_rtpext_handler(struct call_media *in, struct call_media
 	if (!sh || !out)
 		return;
 
-	if (in->extmap.length || out->extmap.length)
+	/* With `force strip extmap` set on the call, use the extmap printer even
+	 * if no header extensions were negotiated, so that unannounced header
+	 * extensions are removed from forwarded RTP. */
+	if (in->extmap.length || out->extmap.length || CALL_ISSET(out->call, FORCE_STRIP_EXTMAP))
 		sh->rtpext = &rtpext_printer_extmap;
 	else
 		sh->rtpext = &rtpext_printer_copy;
diff --git a/docs/ng_control_protocol.md b/docs/ng_control_protocol.md
index ebe58e35c..470c9532f 100644
--- a/docs/ng_control_protocol.md
+++ b/docs/ng_control_protocol.md
@@ -1367,6 +1367,15 @@ Spaces in each string may be replaced by hyphens.
     Legacy alias for `extmap=[strip=[all]]` to remove all `a=rtpmap` attributes
     from the outgoing SDP.
 
+* `force strip extmap`
+
+    Process RTP header extensions of forwarded media even if no header
+    extensions were negotiated in the SDP. Normally, RTP header extensions
+    are passed through untouched if neither side included any `a=extmap`
+    attributes. With this flag set, header extensions that were not
+    negotiated are removed from forwarded RTP. Once set, the flag remains
+    in effect for the lifetime of the call.
+
 * `strict source`
 
 	Normally, *rtpengine* attempts to learn the correct endpoint address for every stream during
diff --git a/include/call.h b/include/call.h
index f88365650..b5861a4d6 100644
--- a/include/call.h
+++ b/include/call.h
@@ -255,6 +255,7 @@ enum {
 #define CALL_FLAG_BLOCK_MEDIA			(1LL << 28)
 #define CALL_FLAG_SILENCE_MEDIA			(1LL << 29)
 #define CALL_FLAG_NO_REC_DB			(1LL << 30)
+#define CALL_FLAG_FORCE_STRIP_EXTMAP		(1LL << 31)
 
 /* access macros */
 #define SP_ISSET(p, f)		bf_isset(&(p)->sp_flags, SP_FLAG_ ## f)
diff --git a/include/call_flags.h b/include/call_flags.h
index 1000af767..09ab29d37 100644
--- a/include/call_flags.h
+++ b/include/call_flags.h
@@ -325,7 +325,9 @@ RTPE_NG_FLAGS_STR_CASE_HT_PARAMS
 		     moh_sendrecv:1,
 		     moh_reflect:1,
 		     /* prevents double MoH holds */
-		     moh_double_hold:1;
+		     moh_double_hold:1,
+		     /* process RTP header extensions even if none were negotiated */
+		     force_strip_extmap:1;
 };