Yes i am sure. below is from Avaya support..............
CS1000 7.5 sw: ERR5306 printed frequently
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Doc ID: SOLN207680
Version: 4.0
Status: Published
Published date: 06 Aug 2012
Updated: 02 Dec 2014
Author: wzhong
Details
ERR5306
CS1KE 7.5
Problem Clarification
Customer site is a hotel and using large number of Analog Set, CS1K prompt ERR5306 frequently on TTY.
ERR5306 0000401F 00002220
ERR5306 0000401F 0000208D
ERR5306 0000401F 000018E3
ERR5306 0000401F 00002055
......
Cause
Customer site is using GALC card rather than old Analog Line Card.
When user is on call, and want to transfer the call, the user will press the flash hook of the Analog Set and release. GLAC can not recognize the flash hook event and then send the error info to Call Server. At last Call Server prompt ERR5306.
Solution:
Design team has addressed this issue and develop new GALC firmware AB11, upgrade GLAC firmware to AB11 to fix this issue.