--- kannel-dev/gateway/gw/smsc_smpp.c	2002-05-05 10:57:31.000000000 +0300
+++ gateway/gw/smsc_smpp.c	2002-05-20 18:19:47.000000000 +0300
@@ -26,7 +26,7 @@
  * stable releases.
  */
 
-#if 1
+#ifndef DEBUG
 /* This version doesn't dump. */
 static void dump_pdu(const char *msg, SMPP_PDU *pdu)
 {
@@ -49,7 +49,7 @@
 #define SMPP_ENQUIRE_LINK_INTERVAL  30.0
 #define SMPP_MAX_PENDING_SUBMITS    10
 #define SMPP_RECONNECT_DELAY	    10.0
-
+#define SMPP_DEFAULT_VERSION        0x34
 
 
 /***********************************************************************
@@ -79,6 +79,7 @@
     int transmit_port;
     int receive_port;
     int quitting;
+    int version;
     SMSCConn *conn;
 } SMPP;
 
@@ -89,7 +90,7 @@
     	    	    	 Octstr *address_range, Octstr *our_host, 
                          int source_addr_ton, int source_addr_npi, 
                          int dest_addr_ton, int dest_addr_npi,
-			 Octstr *my_number)
+			 Octstr *my_number, int version)
 {
     SMPP *smpp;
     
@@ -112,6 +113,7 @@
     smpp->dest_addr_npi = dest_addr_npi;
     smpp->our_host = octstr_duplicate(our_host);
     smpp->my_number = octstr_duplicate(my_number);
+    smpp->version = version;
     smpp->transmit_port = transmit_port;
     smpp->receive_port = receive_port;
     smpp->quitting = 0;
@@ -384,7 +401,7 @@
     else
 	bind->u.bind_transmitter.system_type = 
 	    octstr_duplicate(smpp->system_type);
-    bind->u.bind_transmitter.interface_version = 0x34;
+    bind->u.bind_transmitter.interface_version = smpp->version;
     bind->u.bind_transmitter.address_range = 
     	octstr_duplicate(smpp->address_range);
     send_pdu(conn, bind);
@@ -418,7 +435,7 @@
         bind->u.bind_transmitter.system_type = octstr_create("VMA");
     else   
         bind->u.bind_transmitter.system_type = octstr_duplicate(smpp->system_type);
-    bind->u.bind_transmitter.interface_version = 0x34;
+    bind->u.bind_transmitter.interface_version = smpp->version;
     bind->u.bind_transmitter.address_range = octstr_duplicate(smpp->address_range);
     send_pdu(conn, bind);
     smpp_pdu_destroy(bind);
@@ -452,7 +469,7 @@
     else
 	bind->u.bind_receiver.system_type = 
 	    octstr_duplicate(smpp->system_type);
-    bind->u.bind_receiver.interface_version = 0x34;
+    bind->u.bind_receiver.interface_version = smpp->version;
     bind->u.bind_receiver.address_range = 
     	octstr_duplicate(smpp->address_range);
     send_pdu(conn, bind);
@@ -902,7 +919,7 @@
     SMPP *smpp;
     int ok;
     int transceiver_mode;
-
+    int version;
     
     my_number = NULL;
     transceiver_mode = 0;
@@ -958,10 +976,16 @@
     if (cfg_get_integer(&dest_addr_npi, grp, octstr_imm("dest-addr-npi")) == -1)
        dest_addr_npi = -1;
 
+    if (cfg_get_integer(&version, grp, octstr_imm("interface-version")) == -1)
+        version = SMPP_DEFAULT_VERSION;
+    else
+        /* convert decimal to BCD */
+        version = ((version / 10) << 4) + (version % 10);
+
     smpp = smpp_create(conn, host, port, receive_port, system_type, 
     	    	       username, password, address_range, our_host,
                        source_addr_ton, source_addr_npi, dest_addr_ton, 
-                       dest_addr_npi, my_number);
+                       dest_addr_npi, my_number, version);
 
     conn->data = smpp;
     conn->name = octstr_format("SMPP:%S:%d/%d:%S:%S", 
--- kannel-dev/gateway/gwlib/cfg.def	2002-04-28 12:28:31.000000000 +0300
+++ gateway/gwlib/cfg.def	2002-05-20 18:19:28.000000000 +0300
@@ -209,6 +210,7 @@
     OCTSTR(dest-addr-ton)
     OCTSTR(dest-addr-npi)
     OCTSTR(transceiver-mode)
+    OCTSTR(interface-version)
 )
 
 
--- kannel-dev/gateway/doc/userguide/userguide.xml	2002-05-19 14:56:38.000000000 +0300
+++ gateway/doc/userguide/userguide.xml	2002-05-21 10:13:30.000000000 +0300
@@ -2368,6 +2368,16 @@
        Voice Mail Activation.
      </entry></row>
 
+   <row><entry><literal>interface-version</literal></entry>
+     <entry><literal>number</literal></entry>
+     <entry valign=bottom>
+       Change the "interface version" parameter sent from Kannel to
+       a value other then 0x34 (for SMPP v3.4). the value entered here
+       should be the hexadecimal representation of the interface version
+       parameter. for example, the default (if not set) is "34" which stands
+       for 0x34. for SMPP v3.3 set to "33".
+     </entry></row>
+
    <row><entry><literal>address-range (m)</literal></entry>
      <entry><literal>string</literal></entry>
      <entry valign=bottom>