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This is the support site for Andrews & Arnold Ltd, a UK Internet provider. Information on these pages is generally for our customers but may be useful to others, enjoy!

VoIP Firewall: Difference between revisions

105 bytes removed ,  23 November 2017
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'''SIP''' is the call routing information that creates and manages calls. In practice if you allow port 5060 from the outside world you'll see attacks and possibly receive spam phone calls. We do not recommend leaving 5060 open unless you really know what you are doing. Phones rarely use ports as low as 5060 for media.
 
'''RTP''' is the actual media (e.g., the audio). On theour olderplatform callthe servers itRTP will be as direct as possible the media can be sentcome from anywhere on the internet. Using the newsame call serversserver itIP is only from the same call serveraddress 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:
autoreview, Bureaucrats, editor, Interface administrators, reviewer, Administrators
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