diff --git a/src/svxlink/svxlink/contrib/SipLogic/README.adoc b/src/svxlink/svxlink/contrib/SipLogic/README.adoc
index 8d010910..aa903abf 100644
--- a/src/svxlink/svxlink/contrib/SipLogic/README.adoc
+++ b/src/svxlink/svxlink/contrib/SipLogic/README.adoc
@@ -5,8 +5,7 @@ Contrib: SipLogic
 #
 # SipLogic (beta)
 # Adi Bier / DL1HRC (dl1hrc [at] gmx.de)
-# V0.2.0 - 15.03.2019
-# V0.2.1 - 05.09.2022
+# Version 15112022
 #
 ----
 SipLogic.conf is a sample configuration for a SipLogic connected to a Fritzbox
diff --git a/src/svxlink/svxlink/contrib/SipLogic/SipLogic.conf.5 b/src/svxlink/svxlink/contrib/SipLogic/SipLogic.conf.5
index d944843f..59a5cff7 100644
--- a/src/svxlink/svxlink/contrib/SipLogic/SipLogic.conf.5
+++ b/src/svxlink/svxlink/contrib/SipLogic/SipLogic.conf.5
@@ -152,6 +152,9 @@ format transmitted must match the configuration (+49 != 0049). Whole SIP
 numbers as well as parts of phone numbers can be configured, with the
 evaluation taking place on the left-hand side.
 Example: PHONENUMBER_TO_TG=0049:262,0034:214,0043:232,0049123454543:991
+.TP
+.B USE_TCP
+If set, TCP is used as transport layer instead of UDP (default).
 .
 .SH FILES
 .
diff --git a/src/svxlink/svxlink/contrib/SipLogic/SipLogic.conf.in b/src/svxlink/svxlink/contrib/SipLogic/SipLogic.conf.in
index 57921565..07387cfe 100644
--- a/src/svxlink/svxlink/contrib/SipLogic/SipLogic.conf.in
+++ b/src/svxlink/svxlink/contrib/SipLogic/SipLogic.conf.in
@@ -27,6 +27,7 @@ EVENT_HANDLER=@SVX_SHARE_INSTALL_DIR@/events.tcl
 SIP_PREAMP=3
 SIP_LIMITER_THRESH=-1.0
 PHONENUMBER_TO_TG=0049:262,0034:232,0041:222,017612345678:9999
+#USE_TCP=1
 
 # ToDo, section still not active
 [Phonenumber_to_Tg]
diff --git a/src/svxlink/svxlink/contrib/SipLogic/SipLogic.cpp b/src/svxlink/svxlink/contrib/SipLogic/SipLogic.cpp
index 761f6aa9..3d55931e 100644
--- a/src/svxlink/svxlink/contrib/SipLogic/SipLogic.cpp
+++ b/src/svxlink/svxlink/contrib/SipLogic/SipLogic.cpp
@@ -89,7 +89,7 @@ using namespace pj;
  *
  ****************************************************************************/
 #define DEFAULT_SIPLIMITER_THRESH  -1.0
-#define PJSIP_VERSION "06112022"
+#define PJSIP_VERSION "15112022"
 
 
 /****************************************************************************
@@ -552,11 +552,22 @@ bool SipLogic::initialize(Async::Config& cfgobj, const std::string& logic_name)
     return false;
   }
 
+    // use UDP or TCP?
+  bool use_tcp = false;
+  cfg().getValue(name(), "USE_TCP", use_tcp);
+
   // Sip transport layer creation
   try {
     TransportConfig tcfg;
     tcfg.port = m_sip_port;
-    ep.transportCreate(PJSIP_TRANSPORT_UDP, tcfg);
+    if (use_tcp)
+    {
+      ep.transportCreate(PJSIP_TRANSPORT_TCP, tcfg);
+    }
+    else
+    {
+      ep.transportCreate(PJSIP_TRANSPORT_UDP, tcfg);
+    }
     ep.libStart();
   } catch (Error& err) {
     cout << "*** ERROR creating transport layer in "
@@ -572,6 +583,10 @@ bool SipLogic::initialize(Async::Config& cfgobj, const std::string& logic_name)
   acc_cfg.idUri += m_username;
   acc_cfg.idUri += "@";
   acc_cfg.idUri += m_sipserver;
+  if (use_tcp)
+  {
+    acc_cfg.idUri += ";transport=tcp";
+  }
   acc_cfg.idUri += ">";
   acc_cfg.regConfig.registrarUri = "sip:";
   acc_cfg.regConfig.registrarUri += m_sipregistrar;