diff --git a/core/AmDtmfDetector.cpp b/core/AmDtmfDetector.cpp
index 62b574ac..63eabcf8 100644
--- a/core/AmDtmfDetector.cpp
+++ b/core/AmDtmfDetector.cpp
@@ -33,6 +33,11 @@
 #include <math.h>
 #include <sys/time.h>
 
+// per RFC this is 5000ms, but in reality then 
+// one needs to wait 5 sec on the first keypress
+// (e.g. due to a bug on recent snoms)
+#define MAX_INFO_DTMF_LENGTH 1000 
+
 //
 // AmDtmfEventQueue methods
 //
@@ -119,6 +124,9 @@ void AmSipDtmfEvent::parseLine(const string& line)
 	   line.substr(0, KeyDuration.length()) == KeyDuration)
     {
       m_duration_msec = atol(line.substr(KeyDuration.length(), string::npos).c_str());
+      if (m_duration_msec > MAX_INFO_DTMF_LENGTH)
+	m_duration_msec  = MAX_INFO_DTMF_LENGTH;
+
     }
 }