VoIP Firewall: Difference between revisions
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(Explain the 2 CIDR address blocks needed for 81.187.30.110-119) |
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'''RTP''' is the actual media (e.g., the audio). On the older call servers it will be as direct as possible the media can be sent from anywhere on the internet. Using the new call servers it is only from the same call server as the SIP control messages. On most phones you can configure which ports to use for RTP, so you can restrict this range further. For example, on a Snom Phone the default range for RTP is 49152 to 65534.
In CIDR notation, the IPv4 range 81.187.30.110 - 81.187.30.119 needs two blocks:
181.187.30.110/31
181.187.30.112/29
=Example FireBrick Config=
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