[SR-Users] How can I figure out the problem why call is not establish?

[zhangkai.gis]

Hello.
When I installed kamailio I add users then I can make a call.But When I install asterisk I found the asterisk take over the kamailio and I can register users.But When I make a call.It shows me can not establish the call.How can find the problem?Any logs?Or tools?
Thanks,
zhangkai
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