diff --git a/pjsip-apps/src/pjsua/pjsua_app.c b/pjsip-apps/src/pjsua/pjsua_app.c
index fd60ebb765..a953e6e9c2 100644
--- a/pjsip-apps/src/pjsua/pjsua_app.c
+++ b/pjsip-apps/src/pjsua/pjsua_app.c
@@ -1,5 +1,5 @@
 /* 
- * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2008-2026 Teluu Inc. (http://www.teluu.com)
  * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -1998,9 +1998,7 @@ static pj_status_t app_init(void)
         pjsua_transport_config udp_cfg;
 
         udp_cfg = app_config.udp_cfg;
-        if (udp_cfg.port == 0)
-            udp_cfg.port = 5060;
-        else
+        if (udp_cfg.port != 0)
             udp_cfg.port += 10;
         status = pjsua_transport_create(type,
                                         &udp_cfg,
@@ -2071,7 +2069,9 @@ static pj_status_t app_init(void)
         pjsua_acc_id aid;
         pjsip_transport_type_e type = PJSIP_TRANSPORT_TCP6;
 
-        tcp_cfg.port += 10;
+        if (tcp_cfg.port != 0) {
+            tcp_cfg.port += 10;
+        }
 
         status = pjsua_transport_create(type,
                                         &tcp_cfg,
@@ -2113,11 +2113,15 @@ static pj_status_t app_init(void)
                   sizeof(tcp_cfg.qos_params));
 
         /* Set TLS port as TCP port+1 */
-        tcp_cfg.port++;
+        if (tcp_cfg.port != 0) {
+            tcp_cfg.port++;
+        }
         status = pjsua_transport_create(PJSIP_TRANSPORT_TLS,
                                         &tcp_cfg, 
                                         &transport_id);
-        tcp_cfg.port--;
+        if (tcp_cfg.port != 0) {
+            tcp_cfg.port--;
+        }
         if (status != PJ_SUCCESS)
             goto on_error;
         
@@ -2145,7 +2149,9 @@ static pj_status_t app_init(void)
         pjsua_acc_id aid;
         pjsip_transport_type_e type = PJSIP_TRANSPORT_TLS6;
 
-        tcp_cfg.port += 10;
+        if (tcp_cfg.port != 0) {
+            tcp_cfg.port += 10;
+        }
 
         status = pjsua_transport_create(type,
                                         &tcp_cfg,