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"CP DiscInd reason 21" error on Cisco PGW 2200 Softswitch

I was wondering if someone had experience of this, or could shed some light on this.

An SS7 link will not come up, the signalling error is:

"CP DiscInd reason 21"

Checked the log messages descriptions CISCO has on site, but no 21. Errors  20, 22 relate to SIO .....

http://www.cisco.com/en/US/docs/voice_ip_comm/pgw/9/system/message/MiLogMes.html

Below is output, and log messages section from CISCO.

    Any ideas?

////////////////////////////////////////////////////////////////

mml> rtrv-ne

Vendor:"Cisco Systems Inc.""

Verion:"9.5(2)""

Cisco PGW 2200 Softswitch

*********

ss7 -i-1 (PID 9434) (Error) PROT_ERR_MTP3_LNK_CNTL: Link c7iplink[001d0001] change of state to Out-of-service, cause Link fail

ss7 -i-1 (PID 9434) (Error) PROT_ERR_MTP3: MTP3 Error Message from compId c7iplink1[001d0001]: CP DiscInd reason 21

/opt/CiscoMGC/var/log

ALM=\”SC FAIL\” indicates a signal channel failure.

MESSAGE:

PROT_ERR_MTP3: MTP3 Error Message from compId <component Id>: <general error string>

DESCRIPTION:

The general error string 'CP DiscInd reason xx' indicates failure of SS7 link identified by the 'compId' in the message.

xx indicates the reasons for the failure. The following are the valid reasons:

•00 - Request from the layer management

•01 - SURM failure

•02 - Excessive length of align period

•03 - T7 timer expiration

•04 - Physical interface failure

•05 - 2 out of 3 invalid BSNs

•06 - 2 out of 3 invalid FIBs

•07 - LSSU condition

•08 - Excessive MTP2 congestion

•19 - SIOS received in LSC

•20 - T2 expired waiting for SIO

•22 - SIOS received in IAC

•23 - Proving failure

•24 - T1 expired waiting for FISU

•25 - SIN received while in service

•32 - CTS lost

•37 - No resources

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