On Mon, Dec 15, 2008 at 9:46 AM, Tomasz Zieleniewski <tzieleniewski at gmail.com> wrote: > At the same time the > REFER request implicitly establishes a > subscription to the refer event. This is true as per RFC 3515. Anyway, it could actually depend on the "Refer-Sub" value (RFC 4488). -- Victor Pascual Ávila