OBi, please help us defeat SIP scanners/spammers

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mayge:
HOWTO: Thwarting SIP Scanners during Set-up
http://www.obitalk.com/forum/index.php?topic=5467.0

Quote

Note: Things changed for the better about June/July 2013. OBiTalk has been implementing method 4, Oleg method described below, for at least some of the SIP providers by default. If your provider is not one that OBiTalk lists or if you get a SIP scan, or if you have overridden the X_InboundCallRoute so that OBiTalk does not control the field, or if you choose to not use OBiTalk, the information below will still apply. (note #j)
      =========The need for the following has been reduced========


I'm assuming X_UserAgentPort needs to be unique when multiple obi on LAN (and unique among multiple IP phone control ports)

By using an X_UserAgentPort outside 5060-5080 what pfSense WAN- and LAN rules would the gurus suggest?

I'm using pfsense on the recommendation of one more tech than myself as my previous router had undisablable sip alg.

squalk:
are your OBIs not sitting behind a firewall?  (not routing, not-NAT, merely firewall IDS)

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