From the trace it looks like callmanager is sending this to the gateway. The next step would be to gather the debug isdn q931 to see if the call is hitting callmanager. If it is gather a debug voip ccapi in out. This will tell us if it is a dial peer problem.
But it seems to me, that the problem is not contained in an h323-gw configuration. There is an operational pots dial-peer with destination pattern 5555555, that looks to PRI D-channel. And when I access gateway with help of PBX access-code it matches perfectly and goes to PSTN. 'debug isdn q931' & 'debug voip ccapi inout' also showed nothing. I want to note also, that reorder tone appeared _immideately_ after last (seventh) digit dialed.
I wonder, why ccm doesn't find and show ip address of h323-gw in its trace ?
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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This provides an easy to use form where you simply answer a few
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