Hi, likely the lines have so-called 'point-to-point' config, try configuring "isdn static-tei 0' under the ones for main number.
After that try "term mon", "debug isdn q931" and "isdn test call int x/y 123". x/y is any interface you want to test. You should see a (data) call go out and fail.
Then the rest is proper dial-peer configuration. I strongly suggest you place the lines in trunk-group, this is done configuring "trunk-group bri" under bri interface, and referencing said trunkgroup instead of port in the dial-peer.
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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