Ansewr to a re-Invite without SDP

Hi,

I have some doubts what should be the Included in the SDP media attribute when answering to a re-Invite.

Below is the message flow:

 

A                   B 
|     INVITE/sdp    |
|------------------>|
|                   |
|         180       |
|<------------------|
|                   |
|     200 OK/sdp    |
|<------------------|
|                   |
|reINVITE/sdp a=inact
|<------------------|
|                   |
|200 OK/sdp a=inactiv
|------------------>|
|                   |
|   reINVITE/no sdp |
|<------------------|
|                   |
|200 OK/sdp a=inactiv
|------------------>|

 

My question is, if it is correct the media attribute in the last 200OK to be (a): inactive.

I tried to find the answer in the RFC but could not find a clear answer.

Can anyone help?

Best Regards