DN's ( ACD Queues ) failing to register on both links ( pri and bac )

[Karthik]

Hi,

I have come across a similar issue, where most of the DN's ( configured as ACD queues, switch specific type 3 ) have failed registering to Avaya s8720. Error seen is as following.

TP_AsaiData
  RELEASE_COMPLETE  CRV:b481
  Facility: RETURN_ERROR
  InvokeId: 3
  Error: 196
  Cause: A_RESUNAVL
@09:51:19.2643 [asai] (processFacilityReturnError)
@09:51:19.2643 [gctmi] request SysRequestRegister deactivated in reqMgr
@09:51:19.2643 [gctmi] TMsg [EventError()] distributing to model
@09:51:19.2643 [gctmi] Address [63187,tQ,sOOS] distributing EventError
09:51:19.264 Std 31032 DN Registration Failed: Link[1], DN[63187]
@11/23/08 09:51:19.2644 [31032] DN Registration Failed: Link[1], DN[63187]
@09:51:19.2644 [gctmi] Address [63187,tQ,sOOS] processOutOfService
@09:51:19.2644 [tsgctm] Registrar [63187, l=1, s=0]  RX error response, i=0, c=25a
@09:51:19.2645 [gctmi] request SysRequestRegister removed from reqMgr
@09:51:19.2645 [tsgctm] Registrar [63187, l=1, s=0] giving up.

Also, these DN's have just failed to register on the back up link to avaya, but they have registered with the primary link.
I can also see some DN's which successfully registered with both primary and back up as well

Can you please help here ?