diff --git a/daemon/call.c b/daemon/call.c
index 11208e523..f9f2bafe5 100644
--- a/daemon/call.c
+++ b/daemon/call.c
@@ -4690,6 +4690,7 @@ new_branch:
 	__C_DBG("create new \"other side\" monologue for viabranch "STR_FORMAT, STR_FMT0(viabranch));
 	os = __monologue_create(call);
 	__monologue_viabranch(os, viabranch);
+	goto finish;
 
 have_dialogue:
 	for (unsigned int i = 0; i < ret->medias->len; i++)
@@ -4805,8 +4806,15 @@ static int call_get_dialogue(struct call_monologue *monologues[2], call_t *call,
 	 * if the offer monologue belongs to an unanswered call (empty tag),
 	 * hence `ft->tag` has to be empty at this stage.
 	 */
-	if (!ft || ft->tag.s)
+	if (!ft)
 		ft = __monologue_create(call);
+	else if (ft->tag.s) {
+		// Allow an updated/changed to-tag in answers unless the flag to
+		// suppress this feature is set. A changed to-tag will be stored
+		// as a tag alias.
+		if (!flags || flags->opmode != OP_ANSWER || flags->new_branch)
+			ft = __monologue_create(call);
+	}
 
 tag_setup:
 	if (ft == tt)
diff --git a/daemon/call_interfaces.c b/daemon/call_interfaces.c
index ab661d656..cad093241 100644
--- a/daemon/call_interfaces.c
+++ b/daemon/call_interfaces.c
@@ -1104,6 +1104,9 @@ void call_ng_flags_flags(str *s, unsigned int idx, helper_arg arg) {
 		case CSH_LOOKUP("nat-wait"):
 			out->nat_wait = 1;
 			break;
+		case CSH_LOOKUP("new-branch"):
+			out->new_branch = 1;
+			break;
 		case CSH_LOOKUP("no-codec-renegotiation"):
 		case CSH_LOOKUP("reuse-codecs"):
 			out->reuse_codec = 1;
diff --git a/docs/ng_control_protocol.md b/docs/ng_control_protocol.md
index c2bd76c8d..639c73b7a 100644
--- a/docs/ng_control_protocol.md
+++ b/docs/ng_control_protocol.md
@@ -1028,6 +1028,24 @@ Spaces in each string may be replaced by hyphens.
 	direction before sending packets out, which could result in an
 	automated firewall block.
 
+* `new branch`
+
+    If *rtpengine* receives an answer from a to-tag that hasn't previously seen
+    and no corresponding call party is known (created from a previous offer),
+    previously it would treat this is a separate new call branch, create a
+    brand new internal call party, and dissociate the previous one. This may
+    lead to unexpected results as this new call party has been created without
+    the same initialisation as was done for the original one, and so may be
+    left with incorrect or incomplete data (e.g.  SRTP keys, codec information,
+    interface bindings, etc).
+
+    Improve this by treating an unexpected and unseen to-tag as an alias to the
+    already existing to-tag. Going forward both tags can then be used
+    interchangeably to refer to the same monologue.
+
+    This flag suppresses this new behaviour, in case some situation is made
+    worse by it.
+
 * `no port latching`
 
 	Port latching is enabled by default for endpoints which speak
diff --git a/include/call_interfaces.h b/include/call_interfaces.h
index 736d13436..a2cbc3822 100644
--- a/include/call_interfaces.h
+++ b/include/call_interfaces.h
@@ -236,6 +236,7 @@ struct sdp_ng_flags {
 		     pierce_nat:1,
 		     directional:1,
 		     fatal:1,
+		     new_branch:1,
 		     /* to_tag is used especially by delete handling */
 		     to_tag_flag:1;
 };