diff --git a/engine/Channel.cpp b/engine/Channel.cpp
index 8f79aadb..e7c7eb90 100644
--- a/engine/Channel.cpp
+++ b/engine/Channel.cpp
@@ -27,6 +27,40 @@
 
 using namespace TelEngine;
 
+// Find if a string appears to be an E164 phone number
+bool TelEngine::isE164(const char* str)
+{
+    if (!str)
+	return false;
+    // an initial + character is ok, we skip it
+    if (*str == '+')
+	str++;
+    // at least one valid character is required
+    if (!*str)
+	return false;
+    for (;;) {
+	switch (*str++) {
+	    case '0':
+	    case '1':
+	    case '2':
+	    case '3':
+	    case '4':
+	    case '5':
+	    case '6':
+	    case '7':
+	    case '8':
+	    case '9':
+	    case '*':
+	    case '#':
+		break;
+	    case '\0':
+		return true;
+	    default:
+		return false;
+	}
+    }
+}
+
 static unsigned int s_callid = 0;
 static Mutex s_callidMutex;
 
diff --git a/modules/h323chan.cpp b/modules/h323chan.cpp
index c08a4c70..8d4ee514 100644
--- a/modules/h323chan.cpp
+++ b/modules/h323chan.cpp
@@ -208,33 +208,6 @@ static const char* CallEndReasonText(int reason)
 #undef MAKE_END_REASON
 }
 
-static bool isE164(const char* str)
-{
-    if (!(str && *str))
-	return false;
-    for (;;) {
-	switch (*str++) {
-	    case '0':
-	    case '1':
-	    case '2':
-	    case '3':
-	    case '4':
-	    case '5':
-	    case '6':
-	    case '7':
-	    case '8':
-	    case '9':
-	    case '*':
-	    case '#':
-		continue;
-	    case 0:
-		return true;
-	    default:
-		return false;
-	}
-    }
-}
-
 static int cleaningCount()
 {
     Lock lock(s_mutex);
diff --git a/yatephone.h b/yatephone.h
index 6129fd4f..c26a7749 100644
--- a/yatephone.h
+++ b/yatephone.h
@@ -1921,6 +1921,13 @@ protected:
 	{ return m_id; }
 };
 
+/**
+ * Find if a string appears to be an E164 phone number
+ * @param str String to check
+ * @return True if str appears to be a valid E164 number
+ */
+YATE_API bool isE164(const char* str);
+
 }; // namespace TelEngine
 
 #endif /* __YATEPHONE_H */