did anyone face this problem !!!

ello everyone,
I am developping a P2P application using Jain-Sip for communication.
I'm pretty sutck with a problem , here it is :

we have 3 nodes : A.B,C

B has information (URL of C) to ping  the node C,
and node C receive the request and sends a response to B. ('til now it's 
ok).

But now, the node A sends a request to B ,
B receives the request, and before sending a response to A,
B needs to ping C ,
then C receives the request and sends a response to B,
but the PROBLEM !!! is that B doesn't  receive the response from C.

notice : the thread triggered in B by receiving the reuqest from A, is 
blocked,
            waiting for the response from C.

if any one has face the same, I would be very thankful if he could send me 
the solution.

-----------------------------------here are the request 
----------------------------------------------------

A sends to B :

REGISTER sip:[email protected]:7001;transport=tcp SIP/2.0
Call-ID: [email protected]
CSeq: 1 REGISTER
From: <sip:[email protected]:7008;transport=tcp>;tag=6479
To: <sip:[email protected]:7008;transport=tcp>
Via: SIP/2.0/TCP 
127.0.0.1:7008;branch=z9hG4bK4f67136d36f023c9d805912383903d60
Max-Forwards: 6
Contact: <sip:[email protected]:7008;transport=tcp>
Expires: 800
Require: DHT
Supported: DHT
Content-Type: application/DHT+XML
Content-Length: 254

<?xml version="1.0" 
encoding="UTF-8"?><DHTInfo><DHTDescription><DHTOverlayName>Concordia 
DHT</DHTOverlayName><DHTHashAlg>SHA-1</DHTHashAlg></DHTDescription><DHTOperation>nodeRegistration</DHTOperation><DHTNode>sip:[email protected]:7008</DHTNode></DHTInfo>



******************************************************************

B receives from A :

REGISTER sip:[email protected]:7001;transport=tcp SIP/2.0
Call-ID: [email protected]
CSeq: 1 REGISTER
From: <sip:[email protected]:7008;transport=tcp>;tag=6479
To: <sip:[email protected]:7008;transport=tcp>
Via: SIP/2.0/TCP 
127.0.0.1:7008;branch=z9hG4bK4f67136d36f023c9d805912383903d60;rport=7008
Max-Forwards: 6
Contact: <sip:[email protected]:7008;transport=tcp>
Expires: 800
Require: DHT
Supported: DHT
Content-Type: application/DHT+XML
Content-Length: 254

<?xml version="1.0" 
encoding="UTF-8"?><DHTInfo><DHTDescription><DHTOverlayName>Concordia 
DHT</DHTOverlayName><DHTHashAlg>SHA-1</DHTHashAlg></DHTDescription><DHTOperation>nodeRegistration</DHTOperation><DHTNode>sip:[email protected]:7008</DHTNode></DHTInfo>




**********************************************************

......... then during the process of the response to A ........

B sends to C :

MESSAGE sip:[email protected]:7014;transport=tcp SIP/2.0
Call-ID: [email protected]
CSeq: 1 MESSAGE
From: <sip:[email protected]:7001;transport=tcp>;tag=8073
To: <sip:[email protected]:7014;transport=tcp>
Via: SIP/2.0/TCP 
127.0.0.1:7001;branch=z9hG4bKb8d8a56120b598e6f33550fdf21f3b07
Max-Forwards: 6
Contact: <sip:[email protected]:7001;transport=tcp>
Expires: 800
Content-Type: text/plain;charset=UTF-8
Content-Length: 4

PING



************************************************************

C receives from B :

MESSAGE sip:[email protected]:7014;transport=tcp SIP/2.0
Call-ID: [email protected]
CSeq: 1 MESSAGE
From: <sip:[email protected]:7001;transport=tcp>;tag=8073
To: <sip:[email protected]:7014;transport=tcp>
Via: SIP/2.0/TCP 
127.0.0.1:7001;branch=z9hG4bKb8d8a56120b598e6f33550fdf21f3b07;rport=7001
Max-Forwards: 6
Contact: <sip:[email protected]:7001;transport=tcp>
Expires: 800
Content-Type: text/plain;charset=UTF-8
Content-Length: 4

PING

******************************************************************

C reply to B :

SIP/2.0 200 OK
Call-ID: [email protected]
CSeq: 1 MESSAGE
From: <sip:[email protected]:7001;transport=tcp>;tag=8073
To: <sip:[email protected]:7014;transport=tcp>;tag=6300
Via: SIP/2.0/TCP 
127.0.0.1:7001;branch=z9hG4bKb8d8a56120b598e6f33550fdf21f3b07;rport=7001
Content-Type: text/plain;charset=UTF-8
Content-Length: 4

PING

----------------------------------------------------------------------

B doesn't receive the response from C :  <------------------- PROBLEM !!!!

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