4f55f5cb_ISDN_Cause_Codes__Cause_Usage
[Cause#] 84 [Fixit!] N/A [Cause Summary] Call identity in use. [Cause Usage] 
Indicates that the network has received a call suspended request. The call suspend request contained a call identity (including the null call identity) which is already in use for a suspended call within the domain of interfaces over which the call might be resumed.
ISDN Cause Codes
Cause Usage