How about you break it down to basics and try a more general approach to it and then if that works, then you can tailor it more.
Try the slight tweak on your configuration above:
access-list 111 permit udp any any range 8000 9999
ip nat pool voip 192.168.2.88 192.168.2.88 netmask 255.255.255.0 type rotary
ip nat inside source list 111 pool voip
Also ensure that there are no ACLs which would block this traffic and remember that the ACL inbound has to specify the GLOBAL IP and not the internal IP as the access-list inbound is checked before the NATting occurs.
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