Hipath -> CCM6, ISO : http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/pbx/interop/notes/603504nt.pdf
Similar docs from Avaya (http://support.avaya.com/css/P8/documents/100011769) suggest that callback might be configurable on the HiPath as part of the CoS applied to the trunk, maybe get the HiPath engineer to verify it is configured... or if you have, try switching it from ISO to ECMA and see if the functionality changes.
Have you had a look what is being logged when you attempt callback?
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