As far as I know, nope.
However, the much slower and bloated (in my opinion) mediaproxy does exactly this and even more in terms of "billing safeties".

On Thu, 2008-01-10 at 16:11 +0100, Helmut Kuper wrote: 
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Hello,

does anybody know, if openser+rtpproxy are able to detect rtp-timeouts
and react on them? It would be good for billing.

regards
Helmut
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