diff --git a/libsofia-sip-ua/nta/nta.c b/libsofia-sip-ua/nta/nta.c
index f63da1e96..d067a49b8 100644
--- a/libsofia-sip-ua/nta/nta.c
+++ b/libsofia-sip-ua/nta/nta.c
@@ -565,6 +565,7 @@ struct nta_outgoing_s
   unsigned orq_must_100rel:1;
   unsigned orq_timestamp:1;	/**< Insert @Timestamp header. */
   unsigned orq_100rel:1;	/**< Support 100rel */
+  unsigned orq_try_other_tp:1;  /**< Allow app to disable retry on other protocol (default: enable) */
   unsigned:0;	/* pad */
 
 #if HAVE_SOFIA_SRESOLV
@@ -7952,7 +7953,7 @@ nta_outgoing_t *outgoing_create(nta_agent_t *agent,
   ta_list ta;
   char const *scheme = NULL;
   char const *port = NULL;
-  int invalid, resolved = 0, stateless = 0, user_via = agent->sa_user_via;
+  int invalid, resolved = 0, stateless = 0, user_via = agent->sa_user_via, retry_other_tp = 1;
   int invite_100rel = agent->sa_invite_100rel;
   int explicit_transport = 1;
   int call_tls_orq_connect_timeout_is_set = 0;
@@ -8037,6 +8038,9 @@ nta_outgoing_t *outgoing_create(nta_agent_t *agent,
       call_tls_orq_connect_timeout = t->t_value;
       if (call_tls_orq_connect_timeout > NTA_TIME_MAX) call_tls_orq_connect_timeout = NTA_TIME_MAX;
     }
+    else if (ntatag_retry_other_tp == tt) {
+      retry_other_tp = t->t_value != 0;
+    }
   }
 
   orq->orq_agent    = agent;
@@ -8062,6 +8066,7 @@ nta_outgoing_t *outgoing_create(nta_agent_t *agent,
   orq->orq_uas       = !stateless && agent->sa_is_a_uas;
   orq->orq_call_tls_connect_timeout_is_set = call_tls_orq_connect_timeout_is_set;
   orq->orq_call_tls_connect_timeout = (call_tls_orq_connect_timeout > 0) ? call_tls_orq_connect_timeout : 0;
+  orq->orq_try_other_tp = retry_other_tp;
 
   if (cc)
     orq->orq_cc = nta_compartment_ref(cc);
@@ -8404,7 +8409,7 @@ outgoing_send(nta_outgoing_t *orq, int retransmit)
     if (cc)
       nta_compartment_decref(&cc);
 
-    if (orq->orq_user_tport)
+    if (orq->orq_user_tport || !orq->orq_try_other_tp)
       /* No retries */;
     /* RFC3261, 18.1.1 */
     else if (err == EMSGSIZE && !orq->orq_try_tcp_instead) {
diff --git a/libsofia-sip-ua/nta/nta_tag.c b/libsofia-sip-ua/nta/nta_tag.c
index c877ffb82..349290d59 100644
--- a/libsofia-sip-ua/nta/nta_tag.c
+++ b/libsofia-sip-ua/nta/nta_tag.c
@@ -1244,6 +1244,16 @@ tag_typedef_t ntatag_tag_3261 = BOOLTAG_TYPEDEF(tag_3261);
  */
 tag_typedef_t ntatag_rel100 = BOOLTAG_TYPEDEF(rel100);
 
+/**@def NTATAG_RETRY_OTHER_TP(x) 
+ * 
+ * Enable or disable retry on other transports
+ *
+ * @par x Boolean (0 to disable, 1 to allow retry)
+ * @default 1 (retry is enabled)
+ * 
+ */
+tag_typedef_t ntatag_retry_other_tp = BOOLTAG_TYPEDEF(retry_other_tp);
+
 /**@def NTATAG_NO_DIALOG(x)
  *
  * Create a leg without dialog. */
@@ -1417,23 +1427,23 @@ tag_typedef_t ntatag_tcp_rport = BOOLTAG_TYPEDEF(tcp_rport);
  */
 tag_typedef_t ntatag_tls_rport = BOOLTAG_TYPEDEF(tls_rport);
 
-/**@def NTATAG_TLS_ORQ_CONNECT_TIMEOUT(x)
- *
- * Connect Timeout for outgoing requests using TLS.
- *
- * @par Used with
- *    nua_create(), nua_set_params(),
- *    nta_agent_create(), nta_agent_set_params()
- *
- * @par Parameter type
- *    unsigned
- *
- * @par Values
+/**@def NTATAG_TLS_ORQ_CONNECT_TIMEOUT(x)
+ *
+ * Connect Timeout for outgoing requests using TLS.
+ *
+ * @par Used with
+ *    nua_create(), nua_set_params(),
+ *    nta_agent_create(), nta_agent_set_params()
+ *
+ * @par Parameter type
+ *    unsigned
+ *
+ * @par Values
  * - 0 - Disabled
  * - value - Milliseconds
  *
- * @NEW_1_13_2
- */
+ * @NEW_1_13_2
+ */
 tag_typedef_t ntatag_tls_orq_connect_timeout = UINTTAG_TYPEDEF(tls_orq_connect_timeout);
 
 /**@def NTATAG_PRELOAD(x)
diff --git a/libsofia-sip-ua/nta/sofia-sip/nta_tag.h b/libsofia-sip-ua/nta/sofia-sip/nta_tag.h
index 203cb4733..196f637d4 100644
--- a/libsofia-sip-ua/nta/sofia-sip/nta_tag.h
+++ b/libsofia-sip-ua/nta/sofia-sip/nta_tag.h
@@ -345,6 +345,9 @@ NTA_DLL extern tag_typedef_t ntatag_cancel_487_ref;
 NTA_DLL extern tag_typedef_t ntatag_rel100;
 #define NTATAG_REL100(x)     ntatag_rel100, tag_bool_v((x))
 
+NTA_DLL extern tag_typedef_t ntatag_retry_other_tp;
+#define NTATAG_RETRY_OTHER_TP(x)     ntatag_retry_other_tp, tag_bool_v((x))
+
 NTA_DLL extern tag_typedef_t ntatag_rel100_ref;
 #define NTATAG_REL100_REF(x) ntatag_rel100_ref, tag_bool_vr(&(x))