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Connection to ITSP SIP Trunk via dedicatet Interface.

Hi, 

I've read many similar topics on this Forum but solutions unfortunetelly doesn't work in my case. 

ITSP give me a dedicated Interface with other IP address (eg 172.18.202.70/30) and SIP Proxy 172.18.100.10 . In normal situation to avoid any problems I could connect this Interface directly to my PABX LAN Interface, but I have also Internal IP Phones which have to be connected to the same Interface in PABX (Internal Address 192.168.30.250). So I have connected ITSP Router Interface to eth4 on my UTM, LAN port of PABX is connected to eth0 VLAN 30 (VoIP) the same like ipphones. I've created Masquerading VoIP->ITSP VoIP (Interface from ITSP), and DNAT like below.  But this doesn't work. Maybe some of you have any idea how to resolve a problem with connection to ITSP.

DNAT
Traffic selector: Any Any ITSP VoIP (Address)
Destination translation: Unify_192.168.30.250
Automatic Firewall rule:
Initial packets are logged:


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