Matadi in DRC is the place where many southbound travelers secure an Angola visa. We tried in both Cameroon and Congo in early 2009 and like everyone else I know of were rejected.
In Matadi February 2009, the process was fairly easy. No letter of invitation was required, though we did have one. Don't expect anything more than a five-day transit visa, though.
The search function will supply some more info, have been a number of threads about this. Good luck.
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