Incoming calls works only when set failover on outgoing

Hi,
I have strange problem to be honest.
We’ve installed VitalPBX - cannot find solution for this strange problem on others forums so decided to post it here since its based on Asterisk.
I’ve set trunk, incoming and outgoing rules.
Outgoing works well I can call any number, ext and my phone.
When I’m trying to call into PBX I can see in logs for example lines like:

Executing [s-1@cos-all-post:4] NoOp("PJSIP/XXXXX-00000479", "Hangup Cause: 38, Dial Status: CHANUNAVAIL") in new stack
    -- Executing [network_error@sub-hangup-cause:1] NoOp("PJSIP/XXXXXX-00000479", "Network Error") in new stack
    -- Executing [network_error@sub-hangup-cause:2] Playback("PJSIP/XXXX-00000479", "im-sorry&cannot-complete-network-error&please-try-again-later,noanswer") in new stack
Everyone is busy/congested at this time (1:0/0/1)

But when I change IN OUTBOUND RULES FAILOVER DESTINATION on extentions it suddendly start calling.
Did anybody had simillar problem?

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