Deployed an NG5-GT out to a remote site to get a phone up and running behind it via ipsec VPN. Tested everything locally before deployment and phone registration was all good. Once shipped to site, the phone wouldn't register. We'd see attempts to register in CUCM logs but we'd see it marked as 'rejected' and log analysis would show a Transient Connection and Registration Failure.
Ended up switching off the ALG for SCCP (Security > ALG) and the phone registered fine.
Just in case anyone ever has the same issue.
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