VoIP Security: Difference between revisions

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See: [[VoIP Call Rate Limits]]

== IP ~~Allow~~ List (restrict access by IP) ==

== IP Access List (restrict access by IP) ==

IP ~~Lockdown~~ - a VoIP number can be given an IP address to which is only allowed to register (i.e. you can add the IP of your phone, and only that phone will be able to register)

IP Access List - a VoIP number can be given an IP address to which is only allowed to register (i.e. you can add the IP of your phone, and only that phone will be able to register)

⚫

You can specify the IP as a subnet in CIDR format, e.g. 192.0.2.0/29, and multiple IPs can be comma separated.

[[File:ControlPages-VoIP-IPLockdown.png|none|frame|IP Lockdown, comma separated etc.]]

⚫

~~On the Voiceless platform you~~ can specify the IP as a subnet in CIDR format, e.g. 192.0.2.0/29, and multiple IPs can be comma separated.

Valid examples:

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The system can send advisory messages when a billing amount is reached. This is set per number on the [[:Category:Control Pages|Control Pages]]. The email set for the Number and for the Login is used.

During the month, each time the amount is reached an email will be sent. At the end of the month the amount is reset.

This feature was added in October 2011, the default warning level is £10, and numbers ~~who~~ used over £10 in September the rate was set to 1.2 times ~~Septembers~~ bill amount.

This feature was added in October 2011, the default warning level is £10, and for numbers which used over £10 in September the rate was set to 1.2 times September's bill amount.

== IP and User Agent Warning Emails ==

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==Keep the Software/Firmware updated==

Regularly checking for software updates is strongly recommended. eg, check the website of the phone manufacturer for updates.

Regularly checking for software updates is strongly recommended. e.g., check the website of the phone manufacturer for updates.

*[[SNOM Firmware Updates]]

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==Physical Security==

If you think your equipment may be in a semi-hostile environment, then look in to enabling pin codes on the actual phone - ie a key lock feature.

If you think your equipment may be in a semi-hostile environment, then look in to enabling pin codes on the actual phone - i.e. a key lock feature.

==Snom Phones==

Snom has a page about securing their devices on their wiki: ~~http~~://~~wiki~~.snom.com/~~FAQ~~/~~How_do_I_secure_my_phone~~

Snom has a page about securing their devices on their wiki: https://service.snom.com/display/wiki/How+do+I+secure+my+Snom+phone

=Odd incoming calls that are not on the CDRs?=

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Solution: Firewall SIP as explained above.

Also some equipment may support the disabling of calls being sent direct from the Internet. For example, Grandstream firmware often has a feature ''Allow Incoming SIP Messages from SIP Proxy Only'', which is worth using (unless you need to accept such calls).

Your equipment may also support a feature whereby incoming INVITE messages are only accepted if they use the User ID which you used when registering with the SIP server, maybe named ''Check SIP User ID for incoming INVITE''. The SIP server will know this User ID, random SIP spammers will not. This User ID is ''not'' the Authentication Username (e.g. +442083xxxxxx), but what is often termed ''Username'' in equipment configuration (where you can set a Username and a Real Name, e.g. ''fred'' and ''Fred Bloggs'') which is used in SIP calls.

[[File:aa-button.png|link=http://aa.net.uk/telecoms.html|Telecoms page on our main website]]

[[Category:VoIP Security]]

[[Category:VoIP]]