Same problem with 1.8.9
I've got the same problem with zabbbix 1.8.9:
19507:20111221:013739.786 discovery: item [.188.8.131.52.184.108.40.206.0] error: OID [.220.127.116.11.18.104.22.168.0] value has unknown type [0x06]
19507:20111221:013739.786 End of discover_service():FAIL
I hope this issue will be addressed - my goal is to link different kind of equipment to different templates and iana enterprise numbers looks like the obvious choice.