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.
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