Hello, saving an invite for later use can be achieved with t_suspend()/t_continue -- see the tmx module. However, regarding what you need, how do you plan to generate the sdp for early media/183? You need ip, port and media description, are they going to be just some random/invalid values? Cheers, Daniel On 24/08/15 20:28, Serge Yuriev wrote: > Hello, > > Our PBX (Cisco CallManager) uses "late offer" sending invites w/o sdp. After receiving provisional reply 18x it answers prack with sdp > I'm trying to realize following scenario: > > 1 Pbx (invite no sdp) > 2 kamailio hold and saves invite > 3 send 183 to Pbx > 4 get prack with sdp > 5 construct new invite from saved one and sdp from prack > 6 send it to calee > > Is this possible? How to save invite for future use? >