We have Cisco video conference bridge on TCS, Expressway C &E, the exp-c is connected with the call conductor and Call manager. when a call comes from internet (eg. Cisco spark) on the bridge, it creates a session but drops out immediately. however, i call from a spark can end reach any endpoints as well as IP phones.
Any SIP calls coming from internet could not also joins our bridge but we can see the call reaches on the call conductor.
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TraversalZone -> Zone001ToTraversalSZ -> TraversalSubZone -> Zone010ToTraversalSZ -> CUCM Neighbor
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we have opened all possible ports.
kindly assist.
