> There are a lot of good reasons of not using STUN but there are no good 
> reasons of not using STUN for UDP keep-alive. STUN keep-alive is extremely 
> easy to implement. It is possible to verify packet validity and it can be 
> used to detect local IP change.

Do you know any implementation (=product) which uses STUN for
keepalive but not for the actual SIP communication?
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