relay backend doesn't support pagedResult control

Hello list.

I managed to get a correct relay backend configured, so as to remap 
attributes, thanks to previous help from people here. It works OK 
through ldapsearch. However, I still can't use it with the target cisco 
appliance, as pagedResult control doesn't work:
Oct  2 14:07:29 etoile slapd[30006]: conn=118 op=1 SRCH 
base="ou=telephony,dc=msr-inria,dc=inria,dc=fr" scope=2 deref=3 
filter="(objectClass=inetOrgPerson)"
Oct  2 14:07:29 etoile slapd[30006]: conn=118 op=1 SRCH attr=uid 
givenname initials sn manager departmentnumber telephonenumber mail 
title homephone mobile pager
Oct  2 14:07:29 etoile slapd[30006]: conn=118 op=1 SEARCH RESULT tag=101 
err=12 nentries=0 text=critical control unavailable in context

When debug level is set to 1, I get this:
Oct  2 14:16:15 etoile slapd[6002]: => get_ctrls
Oct  2 14:16:15 etoile slapd[6002]: => get_ctrls: 
oid="1.2.840.113556.1.4.319" (critical)
Oct  2 14:16:15 etoile slapd[6002]: <= get_ctrls: n=1 rc=0 err=""

Reading ITS 5191, I understand it is supposed to have been fixed in 2.4 
release. However, I'm using 2.4.11, and I'm still getting the problem. 
Should I reopen the ticket ?

Here's my configuration, if that matters. Trying to make the relay 
database subordinate to the other one doesn't change the problem.

database          relay
suffix            ou=telephony,dc=msr-inria,dc=inria,dc=fr
overlay           rwm
rwm-suffixmassage ou=users,dc=msr-inria,dc=inria,dc=fr

rwm-map attribute telephoneNumber homePhone
rwm-map attribute telephoneNumber

database        bdb
suffix          "dc=msr-inria,dc=inria,dc=fr"
rootdn          "cn=root,dc=msr-inria,dc=inria,dc=fr"

--

-- 
Guillaume Rousse
Moyens Informatiques - INRIA Futurs
Tel: 01 69 35 69 62