--- telnetlib-orig.py	2003-04-17 16:19:44.000000000 -0400
+++ telnetlib.py	2003-04-17 17:07:21.000000000 -0400
@@ -55,6 +55,8 @@
 DO   = chr(253)
 WONT = chr(252)
 WILL = chr(251)
+SB   = chr(250) # interpret as subnegotiation
+SE   = chr(240) # end sub negotiation
 theNULL = chr(0)
 
 # Telnet protocol options code (don't change)
@@ -118,6 +120,10 @@
 PRAGMA_HEARTBEAT = chr(140) # TELOPT PRAGMA HEARTBEAT
 EXOPL = chr(255) # Extended-Options-List
 
+# sub-option qualifiers
+QUAL_IS   = chr( 0 )  # option is...
+QUAL_SEND = chr( 1 )  # send option
+
 class Telnet:
 
     """Telnet interface class.
@@ -420,6 +426,13 @@
                         self.option_callback(self.sock, c, opt)
                     else:
                         self.sock.sendall(IAC + DONT + opt)
+                elif c == SB:
+                    opt, tmp = '', ''
+                    while tmp != SE:
+                        tmp = self.rawq_getchar()
+                        opt += tmp
+                    if self.option_callback:
+                        self.option_callback( self.sock, c, opt )
                 else:
                     self.msg('IAC %d not recognized' % ord(c))
         except EOFError: # raised by self.rawq_getchar()