diff --git a/README-Tetra-Sip b/README-Tetra-Sip
new file mode 100644
index 00000000..82f588e9
--- /dev/null
+++ b/README-Tetra-Sip
@@ -0,0 +1,20 @@
+Steps to enable Sip dial-out by sending a Tetra state-SDS:
+
+Look for "SipDialOfromTetra.tcl", configure it to your needs and store it under
+/usr/share/svxlink/ebents.d/local
+
+Be sure that you have the valid sipctrl path configured, it must fit to the param
+SIP_CTRL_PTY parameter in your svxlink.conf (section [SipLogic]], e.g.
+
+[SipLogic]
+SIP_CTRL_PTY=/tmp/sipctrl
+
+In the file "SipDialOfromTetra.tcl" configure the line:
+
+    set port [open "/tmp/sipctrl" w+];
+
+With the next updates the configuration will be much easier, I promise ;)
+
+Send questions to dl1hrc {at} . de
+
+mni 73s de Adi / DL1HRC + DN6THW
\ No newline at end of file
diff --git a/src/svxlink/svxlink/SipDialOutfromTetra.tcl b/src/svxlink/svxlink/SipDialOutfromTetra.tcl
new file mode 100644
index 00000000..081547fa
--- /dev/null
+++ b/src/svxlink/svxlink/SipDialOutfromTetra.tcl
@@ -0,0 +1,45 @@
+###############################################################################
+#
+# TetraLogic event handlers
+#
+###############################################################################
+
+#
+# This is the namespace in which all functions below will exist. The name
+# must match the corresponding section "[TetraLogic]" in the configuration
+# file. The name may be changed but it must be changed in both places.
+#
+namespace eval TetraLogic {
+
+#
+# Executed when a DTMF command has been received
+#   cmd - The command
+#
+# Return 1 to hide the command from further processing is SvxLink or
+# return 0 to make SvxLink continue processing as normal.
+# ---> must return 0!
+# adapt the port according to your needs
+#
+proc dtmf_cmd_received {cmd} {
+  variable port;
+  variable number;
+
+  if {[string length $cmd] > 5} {
+    puts "### dialing number $cmd via sip pty";
+    # adapt the port according to your needs: 
+    # "/tmp/ctrl" must be equal to SIP_CTRL_PTY in [SipLogic]-section
+    set port [open "/tmp/sipctrl" w+];
+      set number "C$cmd";
+      puts $port $number;
+    close $port;
+  }
+  return 0;
+}
+
+# end of namespace
+}
+
+
+#
+# This file has not been truncated
+#
diff --git a/src/svxlink/svxlink/SipLogic.cpp b/src/svxlink/svxlink/SipLogic.cpp
index 64b72d9a..b8cf5f93 100644
--- a/src/svxlink/svxlink/SipLogic.cpp
+++ b/src/svxlink/svxlink/SipLogic.cpp
@@ -88,7 +88,7 @@ using namespace pj;
  *
  ****************************************************************************/
 #define DEFAULT_SIPLIMITER_THRESH  -1.0
-#define PJSIP_VERSION "30012022"
+#define PJSIP_VERSION "14032022"
 
 
 /****************************************************************************
@@ -1001,16 +1001,19 @@ void SipLogic::onCallState(sip::_Call *call, pj::OnCallStateParam &prm)
          << ci.totalDuration.msec << " secs" << endl;
     m_out_src->allSamplesFlushed();
 
-    if (calls.empty())
-    {
-      m_outto_sip->setOpen(false);
-      m_infrom_sip->setOpen(false);
-      //onSquelchOpen(false);
-    }
+    unregisterCall(call);
     ss << "hangup_call " << caller << " "
        << ci.totalDuration.sec << "."
        << ci.totalDuration.msec;
   }
+  else if (ci.state == PJSIP_INV_STATE_EARLY)
+  {
+    ss << "pjsip_state_early " << caller;
+  }
+  else if (ci.state == PJSIP_INV_STATE_NULL)
+  {
+    ss << "pjsip_state_null " << caller;
+  }
   else
   {
     cout << "unknown_callstate " << ci.state;
@@ -1235,6 +1238,26 @@ void SipLogic::initCall(const string& remote)
 } /* SipLogic::initCall */
 
 
+void SipLogic::unregisterCall(sip::_Call *call)
+{
+  for (std::vector<sip::_Call *>::iterator it=calls.begin();
+         it != calls.end(); it++)
+  {
+    if (*it == call)
+    {
+      calls.erase(it);
+      break;
+    }
+  }
+
+  if (calls.empty())
+  {
+    m_outto_sip->setOpen(false);
+    m_infrom_sip->setOpen(false);
+    squelch_det->reset();
+  }
+} /* SipLogic::unregisterCall */
+
 /*
  * This file has not been truncated
  */
diff --git a/src/svxlink/svxlink/SipLogic.h b/src/svxlink/svxlink/SipLogic.h
index 6a8dc2b8..77a974fb 100644
--- a/src/svxlink/svxlink/SipLogic.h
+++ b/src/svxlink/svxlink/SipLogic.h
@@ -223,6 +223,7 @@ class SipLogic : public LogicBase
     void callTimeout(Async::Timer *t=0);
     void flushTimeout(Async::Timer *t=0);
     void onSquelchOpen(bool is_open);
+    void unregisterCall(sip::_Call *call);
 
 };  /* class SipLogic */
 
diff --git a/src/svxlink/svxlink/SipLogic.tcl b/src/svxlink/svxlink/SipLogic.tcl
index e047bda7..cbbe98e7 100644
--- a/src/svxlink/svxlink/SipLogic.tcl
+++ b/src/svxlink/svxlink/SipLogic.tcl
@@ -309,6 +309,20 @@ proc call_state_confirmed {caller} {
 proc unknown_callstate {caller} {
 }
 
+
+#
+# do not use!
+#
+proc pjsip_state_early {caller} {
+}
+
+
+#
+# do not use!
+#
+proc pjsip_state_null {caller} {
+}
+
 # end of namespace
 }