B2BUA Hold problem

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Hi

I am implementing B2BUA application where i m new to SIP.

Where i want B2BUA application keep SJPhone hold in communication.

here are details.
                                                        (B2BUA)
                                                                 |
                                                                V
A ----- >INVITE (with initial SDP) --------->  (Stateless Proxy -fwd)
----------> B
A <-----  200OK (with remote SDP)<--------(Statelss proxy fwd )
<------------ B

A<--------- INVITE (with remoteSDP
                         having C = 0.0.0.0 <------- (StatelessProxy Create
Req)
                         a= sendonly + remote SDP )

A ---------> 200OK


is it prossible to make changes in stateless proxy make A -hold..

i could able to capture the remote SDP but couldn't able to send that using
pjsip_endpoint_create_request() method.
do i need to use SDP neg function  create_w_local_offer() kind of
functions..

i m sending that peice of code's response method

plz help me...

Thanks in advance
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