diff --git a/src/ThreadedGSM.cpp b/src/ThreadedGSM.cpp
index dcba7ee..047e631 100644
--- a/src/ThreadedGSM.cpp
+++ b/src/ThreadedGSM.cpp
@@ -90,6 +90,8 @@ void ThreadedGSM::exec()
             mJob = REQ_STARTUP;
         else if (mRequests & REQ_BATTERY)
             mJob = REQ_BATTERY;
+        else if (mRequests & REQ_HANGUP)
+            mJob = REQ_HANGUP;
 
         if (mJob) {
             mState = 0;
@@ -111,6 +113,8 @@ void ThreadedGSM::exec()
         Outbox();
     else if (mJob == REQ_BATTERY)
         Battery();
+    else if (mJob == REQ_HANGUP)
+        Hangup();
     else
         CheckRing();
 }
@@ -335,6 +339,29 @@ void ThreadedGSM::Battery()
     }
 }
 
+void ThreadedGSM::Hangup()
+{
+    int lastState = mState;
+
+    switch (mState) {
+        case HANGUP_REQ:
+            mDte.SendCommand(F("ATH\r"), THREADEDGSM_AT_TIMEOUT, "OK\r");
+            mState = HANGUP_CHK;
+            break;
+
+        case HANGUP_CHK:
+            if (mDte.getResult() == DTE::EXPECT_RESULT) {
+                clearReq(REQ_HANGUP);
+            } else
+                clearReq(REQ_HANGUP);
+            break;
+    }
+    if (mState != lastState) {
+        DEBUG_PRINT(F("HANGUP_STATE: "));
+        DEBUG_PRINTLN(mState);
+    }
+}
+
 void ThreadedGSM::clearReq(int req)
 {
     mRequests &= ~(req);
@@ -498,41 +525,75 @@ void ThreadedGSM::Outbox()
 
 void ThreadedGSM::CheckRing()
 {
-    int lastState = mRingState;
 
-    switch (mRingState) {
-        case RING_WAIT:
-            if (mDte.buffer()) {
-                String & buffer = mDte.getBuffer();
+    if (mDte.buffer()) {
+        String & buffer = mDte.getBuffer();
 
-                if (buffer.length() > 0) {
+        if (buffer.length() > 0) {
+            bool dump = true;
 
-                    TRACE(TRACE_INFO, F("Gsm: %s"), buffer.c_str());
-                    mDte.clearBuffer();
+            if (buffer.startsWith(F("+CLIP: \""))) {
+                // CLIP (RING) detected
+                if (mConfiguration.ring) {
+                    int index = 8;
+                    int endindex;
+
+                    endindex = buffer.indexOf(F("\""), index);
+                    if (endindex >= 0) {
+                        String num = buffer.substring(index, endindex);
+
+                        mConfiguration.ring(*this, num);
+                        dump = false;
+                    }
+                }
+            } else if (buffer.startsWith(F("NO CARRIER"))) {
+                // end of call detected
+                if (mConfiguration.ring) {
+                    String num = F("end");
+
+                    mConfiguration.ring(*this, num);
+                    dump = false;
+                }
+            } else if (buffer.startsWith(F("+CMTI: \"SM\""))) {
+                // SMS receive detected
+                if (mConfiguration.incoming) {
+                    mRequests |= (REQ_INBOX);
+                    dump = false;
                 }
             }
-            break;
-
-        case RING_CHK:
-            if (mConfiguration.ring != nullptr) {
-                String s = "Ring";
-                mConfiguration.ring(*this, s);
+            if (dump) {
+                TRACE(TRACE_DEBUG, F("Gsm: %s"), buffer.c_str());
             }
-            mRingState = RING_WAIT;
-            break;
-    }
-    if (mRingState != lastState) {
-        DEBUG_PRINT(F("RING_STATE: "));
-        DEBUG_PRINTLN(mRingState);
+            mDte.clearBuffer();
+        }
     }
 }
 
 void ThreadedGSM::startupDone()
 {
-    mRequests |= ((REQ_CLOCK) | (REQ_SIG) | (REQ_BATTERY));
+    if (mConfiguration.clock)
+        mRequests |= (REQ_CLOCK);
+    if (mConfiguration.battery)
+        mRequests |= (REQ_BATTERY);
+    if (mConfiguration.signal)
+        mRequests |= (REQ_SIG);
+    if (mConfiguration.incoming)
+        mRequests |= (REQ_INBOX);
     clearReq(REQ_STARTUP);
     for (unsigned long & i : tickSync)
         i = millis();
     if (mConfiguration.ready != nullptr)
         mConfiguration.ready(*this);
 }
+
+void ThreadedGSM::hangup()
+{
+
+    mRequests |= (REQ_HANGUP);
+}
+
+void ThreadedGSM::restartModem()
+{
+
+    mRequests |= (REQ_STARTUP);
+}
diff --git a/src/ThreadedGSM.h b/src/ThreadedGSM.h
index 57cd150..53b8a86 100644
--- a/src/ThreadedGSM.h
+++ b/src/ThreadedGSM.h
@@ -140,6 +140,11 @@ class ThreadedGSM : public Executable
         SEND_CHK_OK
     };
 
+    enum StateHangup {
+        HANGUP_REQ,
+        HANGUP_CHK
+    };
+
     enum StatesCheckRing {
         RING_WAIT,
         RING_CHK,
@@ -152,8 +157,8 @@ class ThreadedGSM : public Executable
         int Index; // Index of read message
     } Message{};
 
-    SMSInfo mSMSi; // Inbox SMS (incoming)
-    SMSInfo mSMSo; // Outbox SMS (outgoing)
+    SMSInfo mSMSi{}; // Inbox SMS (incoming)
+    SMSInfo mSMSo{}; // Outbox SMS (outgoing)
 
     Stream & mStream;
     DTE mDte;
@@ -172,6 +177,7 @@ class ThreadedGSM : public Executable
         REQ_OUTBOX = 8,
         REQ_STARTUP = 16,
         REQ_BATTERY = 32,
+        REQ_HANGUP = 64,
     };
     int mRequests = 0;
     int mState = 0;
@@ -200,6 +206,10 @@ class ThreadedGSM : public Executable
 
     void sendSMS(String & Number, const char * Text);
 
+    void hangup();
+
+    void restartModem();
+
   protected:
     void startupDone();
 
@@ -219,5 +229,7 @@ class ThreadedGSM : public Executable
 
     void Outbox();
 
+    void Hangup();
+
     void CheckRing();
 }; // ThreadedGSM