[reSIProcate] Calling DialogUsageManager.post(...) from a thread

[Daniel Pocock]

The RADIUS library I'm using blocks when doing a lookup.

Therefore, I'm planning to put each blocking call into it's own thread 
(unless someone can suggest a non-blocking alternative to radiusclient-ng).

At the end of the call, a UserAuthInfo message needs to be posted using 
DialogUsageManager.post(...)

Is this function safe to call from another thread, or is there another 
recommended way of accomplishing all this?