wrong request uri in ack

[Juha Heinanen]

  > even without alsa problem, i could not have made the call with minisip.
  > it is namely sending ack to 200 ok (which ack is in-dialog request)
  > using the same r-uri as in initial invite, when it should use contact
  > uri of 200 ok.  see RFC 3665 for examples.

> It should be fixed in SVN revision 2499.

my version was 2600 so perhaps the bug has re-appeared?

-- juha