diff --git a/sol/sol_context.cpp b/sol/sol_context.cpp
index c00d01c..08be77b 100644
--- a/sol/sol_context.cpp
+++ b/sol/sol_context.cpp
@@ -95,6 +95,14 @@
             acceptedCount = input.size();
         }
     }
+    /*
+     * SOL payload with no character data and valid sequence number can be used
+     * as method to keep the SOL session active.
+     */
+    else if (input.empty() && seqNum)
+    {
+        respAckSeqNum = seqNum;
+    }
 
     if (seqNum != 0)
     {