daniel,

you wrote:

  This feature should be useful in mobile networks, to avoid stacking lot 
  of invalid contacts which could result in lot of branches causing many 
  retransmissions.

why would a sip ua that runs in a mobile network device be configured to
use udp instead of tcp?

poor battery life seems to be a big problem in so called smart phones.
wouldn't this kind of active pinging make it even worse?

-- juha

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