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1 .Used VOIP protocols:SIP, H.3232. Firewall location: between the Gateway Router and Access Servers.
3. VPN (Client, Site to Site) terminated in a router inside the network (behind the firewall).
All except G711 & H323 so u have to add exceptions for other ports and protocols manually
by default all incoming traffic is blocked on any vendor firwall if you want to make communication then which services you want that service protcol is allowed exmaple you want voip allowed sip h323 prtocol traffic
Traffic from untrusted interface is blocked
all network layer traffic will be blocked unless you allow it with an extended access list. ARP traffic is allowed through the transparent firewall without an access list
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