cisco callmanager 4.0 with external gateway

i've configured a trunk between cm and a avaya argent office pbx. i can make calls from outside (a gsm handy) through the trunk to a voip-phone (connected to the callmanager) --> everything is ok!

also the internal calls are ok (analog phones connected to the avaya pbx voip-phones connected to the cm)

if i try to do it in the other direction (voip-phone --> cm --> trunk

--> avaya pbx --> pstn --> gsm handy) the handy starts ringing but at the same moment the call is disconnected on the avaya pbx (monitoring tool installed). i can take the call on the handy (it rings for a longer time) but if i do so, there is no connection. is there a sinaling-problem? do i've to configure something special on the cm for austria?

has anybody an idea? thx for your help!

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