[Serusers] About the Inter SIP Proxy Problem

[AR.]

Dear ALL

   I  have two SIP Proxy servers , One is SER, another one is CSPS (cisco)

When I call a phone number that is belong to the CSPS routing, using the SER subscriber, the packet form SER to CSPS will get a problem with "400 Bad request" .
(It's ok, If the UA in CSPS call to the UA in SER)

My architecture is :
    UA1----SER----B2BUA---RADIUS
                 |
                 |
           Internet
                |
                |
            CSPS--UA2
               
 Logs of B2BUA :
 20060412-144443.276 [57396144] WARN bcWorker: uaState/UaStateRinging.cxx:133 UaStateRinging::Received 400
20060412-144443.276 [57396144] INFO bcWorker: controlState/StateCallReady.hxx:98 StateCallReady::bye was called, incomplete transaction

Does anyone know how to solve it?

thanks

AR.
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