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srp521w issues with functionality and firmware

A client picked up a Cisco SRP521w router for use with a asterisk based pbx using sip.  We installed it but immediately had issues with being unable to register our sip trunks and being unable to resolve this issue switched it back out.  Looking at things more closely we now realize that the status shows the firmware as being v1.2.4 which is beyond Cisco's latest v1.01.29.  Can anyone shed some light on this?  Did my client pick up a bad router?  The router looks like a legitimate Cisco (as far as we can tell).  Any help or suggestions would be appreciated.  Thanks.