How a conference server can respond with 486 error code for a reinvite

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Hi,

I am trying to implement conference manager.

Scenario is as follows;

Participant wants to perform 'call hold' through reinvite.

Participant A  ------>(reinvite)             *conference manager*
----------->(reinvite)  Participant B


----------->(reinvite) Participant C


(200 ok)<------------- Partcipant B


(200 ok)<-------------- Participant C

                 (200 ok)<---------


Conference manager will respond with 200 ok only after receiving 200 ok
from both participant B and C.

If for some reason 200 ok is not received from either participant A or C,
then conference manager should respond with "486 One or more participant is
temporarily unavailable" error code.

I am not able to find a way to send error code for a reinvite  ?

In case of sdp negotiation failure or any other failure, pjsip responds
with "488 Not acceptable here" by itself. But here, this error code will
send incorrect message to participant.

-kindly guide.
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