diff -urN setup-2.4.4/etc/services setup-patch/etc/services
--- setup-2.4.4/etc/services	2003-09-16 01:54:44.000000000 +0200
+++ setup-patch/etc/services	2003-09-18 15:50:24.000000000 +0200
@@ -4551,7 +4551,7 @@
 x25-svc-port	1998/udp		# cisco X.25 service (XOT)
 tcp-id-port	1999/tcp		# cisco identification port
 tcp-id-port	1999/udp		# cisco identification port
-callbook	2000/tcp
+callbook	2000/tcp	sieve	# sieve is used by cyrus-imapd timsieved daemon
 callbook	2000/udp
 dc		2001/tcp
 wizard		2001/udp		# curry