1.2.10 ->, MoH and Milliwatt gone

I am replacing our old asterisk server with a new machine running Centos 5.3 and Asterisk

The changeover has been fairly painless but I’m still having probs getting Music on Hold to work - and for that matter Milliwatt too.

extensions.conf:exten => 87,1,DateTime() exten => 88,1,MusiconHold(default) exten => 89,1,Milliwatt()

musiconhold.conf[default] mode=files directory=/var/lib/asterisk/moh

There are some wav, ulaw and alaw files in /var/lib/asterisk/moh

If I dial 87 I can hear the data and time but with 88 or 89 I hear nothing.