Through a lot of trial and error, I've come to the conclusion that the only way to have the SPA-112 send registration-failure messages to a syslog server is to set the unit to debug-mode logging. No other less "chatty" settings will send Sip-registration failure messages. In this debug mode, the unit sends about 3 messages *per second* on a continuous basis to the syslog server. Naturally, the vast majority of these messages are garbage (from my point of view) and totally not needed. If anyone here has a different experience with this, let me know.
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