Telcoengineer,
Are you trying to set it up as a SIP Gateway or SIP Trunks? Personally I would treat it the same way I would an Audiocodes or the Sonus Tenor AF; basically like any ATA. I think I had to make one of these work, on a version 3.2 5000, and that is how I did it. I did find a manual for one on my laptop, but unfortunately I do not have any notes; although it looks to be pretty straight forward on its setup from what I can see.
Here are the settings I would start changing first:
SIP Server would be the 5000 IP Address
Outbound Proxy would be the 5000 IP Address
SIP User ID would be the SIP Trunk Extension Number
Authentication ID would be the SIP Trunk Extension Number
Authentication Password would be blank or the SIP Trunk Extension Number; most likely blank since the 5000 ignores this as a SIP Gateway
SIP Registration would be NO
Hopefully that helps, but it may help if you can explain what they are using them for; 911 only?
Thanks,
TE