Windstream delivers their sip trunking the same way Allstream does so I just used the IP trunk assistant and created an Allstream trunk and the parameters worked. Just needed the host IP they used on site. Peer details that worked for me are as follows:
host=192.168.2.2
type=peer
qualify=yes
insecure=port,invite
dtmfmode=rfc2833
disallow=all
context=from-trunk
allow=ulaw,alaw
trustrpid=yes
sendrpid=yes
canreinvite=no
deny=0.0.0.0/0.0.0.0
permit=192.168.2.0/255.255.255.0