c5738d67__Codes___Telecomuserguides_com__Explanation
[0] 271 [Action] Initiate a Maintenance session to check the telephone firmware version. Contact your local support group. If required, upgrade the telephones that generated the event. [Explanation] 
Incomplete telephone firmware.
Nortel Systems User Guides, Nortel Error Codes - Telecomuserguides.com
Explanation