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SIP call between two companies failing.

hi,

I have connected two companies ip network for internal calling. these companies have respective call managers  (8.6 and 9.1). The GW of each company is configured as H323 gateway but i have configured SIP between the two gateway. The two CUCM are not reachable..following is the scenerio.

(Ex 601) cucm9.1---------H323-----------GW1(10.192.192.1)-------------------SIP--------------(10.192.192.2)GW2--------------------H323-----------------------cucm8.6 (Ex 181)

when i make a call from 601 to 181..the call disconnects after some time. when i check h323 disconnect cause code (on GW1) then it gives following error. for sip see the attached log (its giving return message of 500 and 503).

oosc-ucs-gw#sh h323 gateway cause-codes

CAUSE CODE STATISTICS AT 1d07h

     DISC CAUSE CODE        FROM OTHER PEER    FROM H323 PEER
   1 unassigned number (1)                1                 0

when i make a call from 181 to 601...the call disconnects . when i check h323 disconnect cause code on GW1 then i gives following error. for sip see the attached log (Q.850;cause=86).

oosc-ucs-gw#sh h323 gateway cause-codes

CAUSE CODE STATISTICS AT 1d06h

     DISC CAUSE CODE        FROM OTHER PEER    FROM H323 PEER

  96 mandatory ie missing (               2                 0

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