Hi there, I'm looking for some information before I change one of our setup's from thoses that have done this before. A the moment one of the biggest offices that we supply has the following setup: 2x cable connections - 50mb & 10mb. Controlled by Mikrotik RB450G, with failover routing and QoS. eth1 = 10mb line is for remote management and VOIP (public IP routing directly to the PBX - stun off) eth2 = 50mb line is for all internet traffic eth3 = LAN (to switch) At the moment we have facing a strange intermitting issues: 1) Sometime incoming calls are not routed to the PBX (random; I've never seen it occur, but the users have) 2) All calls after 15-25 minutes have one way audio 3) After an internet/power failure - all outbound SIP registrations do not work - If I disable the 50mb connection; for a few minutes allowing the PBX to send a SIP registration, it will work and then enable the 50mb line and normal configuration works again. Now I'm sure the PBX is working fine; but it has to be something with the mikrotik configuration, but I've hired a few experts which cant see why its occuring. For that reason I'm looking into a using a dual NICs on the server - one facing the internal side of LAN and one for WAN connection to the 10mb line. But before I go about this, what is the best way of changing the setup? Shall I do a reinstall of the 3CX? Also in terms of security; the PBX is running on windows 7 (company requested); what would be the most suitable method to secure the PC? Would you recommend using dual NICs? Alternatively; what hardware do you use when have separate WAN's for general traffic and VOIP traffic? Thanks.