1. 2015-03-27 [12] [Sip-implementors] Sessions Expires with Info sip-imple isshed 2. 2015-03-12 [1] [Sip-implementors] Contact Header Format sip-imple NK 3. 2015-03-01 [3] Re: [Sip-implementors] Session establishment without sip-imple Paul Kyzivat