FreeRadius-Response-Delay

[Pshem Kowalczyk]

Hi,

I would like to delay access-accept responses to some requests (we have
multiple ones coming simultaneously from 2 BNGs, due to the way access
network is built). I found the FreeRADIUS-Response-Delay
and FreeRADIUS-Response-Delay-USec attributes, but I'm clearly doing
something wrong, as the accept is sent immediately:

{...}
Thu May 26 15:19:17 2016 : Debug: (0)                 update {
Thu May 26 15:19:17 2016 : Debug: (0)
&control:FreeRADIUS-Response-Delay := 5
Thu May 26 15:19:17 2016 : Debug: (0)
&control:FreeRADIUS-Response-Delay-USec := 500000
Thu May 26 15:19:17 2016 : Debug: (0)
&reply:FreeRADIUS-Response-Delay := 5
Thu May 26 15:19:17 2016 : Debug: (0)
&reply:FreeRADIUS-Response-Delay-USec := 500000
Thu May 26 15:19:17 2016 : Debug: (0)                 } # update = noopThu
May 26 15:13:54 2016 : Debug: (0) Sent Access-Accept Id 155 from
127.0.0.1:1812 to 127.0.0.1:51976 length 0
Thu May 26 15:19:17 2016 : Debug: (0)   } # post-auth = ok
Thu May 26 15:19:17 2016 : Debug: (0) Sent Access-Accept Id 0 from
127.0.0.1:1812 to 127.0.0.1:33099 length 0
Thu May 26 15:19:17 2016 : Debug: (0)   Cisco-AVPair +=
"ip:qos-policy-out=add-class(sub,(class-default),police(3000),set-ip-dscp(0),set-cos-inner(0))"
{..}
(I've  tried various combinations of the control/reply USec/Sec)
Delay on Auth-Reject works as expected.

googling didn't turn up any examples either.
I'm running 3.0.11 - how are these attributes supposed to be used?
Thx,

kind regards
Pshem