One way is to have your various sip stacks listen on a non-standard port(s) and redirect only vsps:5060 and anyhost:non-standard to pbx:non-standard port on your router, it is better to have your vsp's use the non-standard port for sip signalling but that is not always possible. To prevent drive-by attempts I suggest that 5070 is only a little less likely to get attention, use something above 1024 but way away from 50nn
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