diff --git a/libs/ysig/isup.cpp b/libs/ysig/isup.cpp
index 02c38643..7ef5d9b7 100644
--- a/libs/ysig/isup.cpp
+++ b/libs/ysig/isup.cpp
@@ -23,7 +23,8 @@
  */
 
 #include "yatesig.h"
-#include "string.h"
+#include <yatephone.h>
+#include <string.h>
 
 using namespace TelEngine;
 
@@ -133,6 +134,12 @@ static const SignallingFlags s_flags_paramcompat[] = {
 // Backward call indicators to be copied
 static const String s_copyBkInd("BackwardCallIndicators,OptionalBackwardCallIndicators");
 
+// Control operations
+static const TokenDict s_dict_control[] = {
+    { "validate", SS7MsgISUP::CVT },
+    { 0, 0 }
+};
+
 // Default decoder, dumps raw octets
 static bool decodeRaw(const SS7ISUP* isup, NamedList& list, const IsupParam* param,
     const unsigned char* buf, unsigned int len, const String& prefix)
@@ -2562,6 +2569,49 @@ void SS7ISUP::timerTick(const Time& when)
     }
 }
 
+// Process a component control request
+bool SS7ISUP::control(NamedList& params)
+{
+    String* ret = params.getParam("completion");
+    const String* oper = params.getParam("operation");
+    const char* cmp = params.getValue("component");
+    int cmd = oper ? oper->toInteger(s_dict_control,-1) : -1;
+
+    if (ret) {
+	if (oper && (cmd < 0))
+	    return false;
+	String part = params.getValue("partword");
+	if (cmp) {
+	    if (toString() != cmp)
+		return false;
+	    for (const TokenDict* d = s_dict_control; d->token; d++)
+		Module::itemComplete(*ret,d->token,part);
+	    return true;
+	}
+	return Module::itemComplete(*ret,toString(),part);
+    }
+
+    if (!(cmp && toString() == cmp))
+	return false;
+    Lock mylock(this);
+    ObjList* o = circuits()->circuits().skipNull();
+    SignallingCircuit* cic = o ? static_cast<SignallingCircuit*>(o->get()) : 0;
+    unsigned int code1 = cic ? cic->code() : 1;
+    switch (cmd) {
+	case SS7MsgISUP::CVT:
+	    {
+		unsigned int code = params.getIntValue("circuit",code1);
+		SS7MsgISUP* msg = new SS7MsgISUP(SS7MsgISUP::CVT,code);
+		SS7Label label(m_type,*m_remotePoint,*m_defPoint,m_sls);
+		mylock.drop();
+		transmitMessage(msg,label,false);
+	    }
+	    return true;
+    }
+    mylock.drop();
+    return SignallingComponent::control(params);
+}
+
 // Process a notification generated by the attached network layer
 void SS7ISUP::notify(SS7Layer3* link, int sls)
 {
@@ -3142,7 +3192,8 @@ void SS7ISUP::processControllerMsg(SS7MsgISUP* msg, const SS7Label& label, int s
     switch (msg->type()) {
 	case SS7MsgISUP::CNF: // Confusion
 	    // TODO: check if this message was received in response to RSC, UBL, UBK, CGB, CGU
-	    Debug(this,DebugNote,"%s with cause='%s' diagnostic='%s'",msg->name(),
+	    Debug(this,DebugNote,"%s with cic=%u cause='%s' diagnostic='%s'",
+		msg->name(),msg->cic(),
 		msg->params().getValue("CauseIndicators"),
 		msg->params().getValue("CauseIndicators.diagnostic"));
 	    stopSGM = true;
diff --git a/libs/ysig/yatesig.h b/libs/ysig/yatesig.h
index cf3a2d75..dda88a9a 100644
--- a/libs/ysig/yatesig.h
+++ b/libs/ysig/yatesig.h
@@ -6059,6 +6059,13 @@ public:
      */
     virtual void cleanup(const char* reason = "offline");
 
+    /**
+     * Query or modify ISUP's settings or operational parameters
+     * @param params The list of parameters to query or change
+     * @return True if the control operation was executed
+     */
+    virtual bool control(NamedList& params);
+
     /**
      * Decode an ISUP message buffer to a list of parameters
      * @param msg Destination list of parameters