[SIPForum-discussion] Regarding sequence of 1XX response

[Roy, Nishant Kishore]

Hi all,

I have one call flow like ...

 A               B
 ----------INVITE-->
 <---------183-----
 <--some announcement will be played here ----->
 ------PRACK------>
<------200 ok for PRACK---
<-----180 ringing -----



Mu doubt comes over here can a party B send a 183 before 180 ..... I mean the 1xx response has to maintain in some sequence ?




Regards
Nishant