VoIP is an acronym for "Voice over IP (or Internet Protocol)" which is a term that encapsulates the technologies that enable telephonic communication using the Internet as the carrier network rather than the traditional publicly switched telephone network.

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23
votes
9answers
7k views

Do secure phone lines exist?

I could be out of context here about security, but , I would like to know if phone lines or phone calls over VOIP could be made secure . I know that Skype and other VOIP service providers have to ...
17
votes
1answer
4k views

How can I spoof a phone call and make it appear to come from another phone?

I'm performing a penetration test against a company. Part of my social engineering procedure is to contact the IT department and try to convince them to that I'm an employee in the company and get ...
10
votes
3answers
9k views

Is RedPhone a secure and secret way to communicate?

RedPhone provides end-to-end encryption for your calls, securing your conversations so that nobody can listen in. But really, how is the probability that a voice conversation is wiretapped still? ...
9
votes
3answers
483 views

Is secure Caller ID possible for SIP / VOIP?

Is there any way (standard, proposed or draft) that will allow for secure Caller ID over SIP / VOIP networks? I have constantly heard that Caller ID is insecure when used over these services. Can ...
8
votes
2answers
424 views

How do you Secure VOIP in a large organization

As part of a large organization looking to implement VoIP, to get on the bandwagon of savings and converged network focus, I'm being asked to look at the security concerns to develop a policy to help ...
7
votes
2answers
462 views

Is Mumble encryption end to end?

Is it possible for a Mumble server operator to monitor or record users' conversations? Or are Mumble conversations encrypted end-to-end?
7
votes
1answer
538 views

What are the main issues and best practice security controls when exposing SIP and H.323 to the Internet?

What are the main issues and recommended controls when exposing SIP and H.323 to the Internet (could be for voice, video, and instant messaging traffic or all three)? Specifically I'm looking for ...
6
votes
4answers
122 views

Does a separate internet connection increase security for remote users?

Our network admin has requested that a single remote employee purchase a separate modem in their house for "work" traffic. I question if this is a legitimate security practice of any kind especially ...
5
votes
2answers
11k views

Does chatting over Skype expose my IP address?

Is there a way to identify a person's IP address in Skype, when you're chatting with them? Does this depend on their Skype settings? And if you've recorded chat messages, can they lead to the actual ...
5
votes
2answers
225 views

How to destroy VOIP phone in a proper way?

Are there any standards which consider safe destroying of VOIP phones? I would like to prevent eventual data leakage after devices which have left the company.
5
votes
1answer
620 views

What are the vulnerabilities of VOIP-specific security protocols?

Existing relevant questions: How do you Secure VOIP in a large organization What are the main issues and best practice security controls when exposing SIP and H.323 to the Internet? Do secure phone ...
4
votes
1answer
306 views

Can SIP registrars and VOIP providers eavesdrop?

An e-mail provider provides people with usernames for e-mail accounts. That normally means that they have access to your e-mail if it is unencrypted. Likewise, do sip registrars have access to ...
4
votes
3answers
419 views

How do countries block encrypted protocols like Skype?

I can't make Skype calls outside of my country because they are blocked. As far as I understand, Skype uses strong encryption for the calls, thus, making Deep Packet Inspection unable to detect it. ...
4
votes
1answer
3k views

How are “security levels” of identities in TeamSpeak 3 implemented?

TeamSpeak 3 VoIP communication system uses a concept of so called identities to identify the client to the server. These identities are basically public/private key pairs. In order to prevent people ...
3
votes
2answers
931 views

How to see whether the pcap contains RTP traffic?

I am analyzing the traffic of a VOIP application. I started up wireshark, and made sure no other application was using internet, and then had a a voice call on the application. Wireshark captured some ...
2
votes
2answers
206 views

Eavesdropping in VoIP. Any other software besides Ethereal? [closed]

In school our professor demonstrated how the software Ethereal could be used to eavesdrop VoIP calls. That software no longer seems to exist since the webpages are no longer around. What other ...
2
votes
1answer
69 views

Can IP phones be eavesdropped upon if administrator access is available?

I am interested in demonstrating an attack to my university's security team on IP phones installed at the university. The IP phone models are Siemens optipath410. Basically, using nmap, I identified ...
1
vote
2answers
886 views

How to increase VoIP call security?

I am using VoIP for my office because I can use the same number whether I am in USA or anywhere else. I am using it on my laptop and I have to visit India in the next few days. My friends say rules ...
1
vote
0answers
36 views

DLP for Phone calls [closed]

I would like to know if there is a DLP system that can monitor phone conversation, in order to search for sensitive data leakage by the company users to external users. We know NSA does that :) Is ...
1
vote
1answer
157 views

Are there any potential security risks in connecting to a Murmur (Mumble) server?

I've created a free server on a website, but I'm a bit cautious on connecting to it. Are there any potential security risks in connecting to a Murmur (Mumble) server?
1
vote
0answers
229 views

Configure Asterisk for lan with SRTP enabled SipDroid

I want to have a secured call over internet between two android phones. I have found SipDroid which is an open source SIP client for Android. And also I have followed this to install Asterisk, Dahdi ...
1
vote
0answers
352 views

Does ZRTP provide useful protection, given that the SAS is not verified?

Firstly, some important backstory. I'm producing a corporate version of an IM/VOIP/Screensharing client using the Open Source Jitsi. We are going to be using a central server and have already ...
0
votes
5answers
855 views

What voip client support manual encryption?

In pidgin there is a plugin that we can use to encrypt our messages in chat windows .. Is there anything simular for voip (pc to pc) ? any client that support manual encryption for voice data?(linux)
0
votes
1answer
1k views

Deep packet inspection of VOIP packets

Some telecommunication companies in Europe and maybe in other parts of the world now want to charge their customers for the VOIP traffic (maybe some already are doing it), e.g. the use of Viber, Skype ...
0
votes
1answer
2k views

Asterisk trunk config 'insecure=very'

I had to add 'insecure=very' configuration to a SIP trunk on my freePBX box for it to register. Does this configuration open possible threats for my infrastructure?
0
votes
1answer
36 views

User Binding Request with credentials in Lync Dump

I've dumped a call between two lync clients and saw that there were some UDP packets that look like this: Server -> Client 1132 14.495362000 <serverip> <clientip> STUN 146 ...
-1
votes
1answer
211 views

Impact of attack occured in Radius, DHCP and HTTP servers on VOIP?

Assume we can crash the RADIUS server in a VOIP system. What would be the impact on the confidentiality, integrity, and availability of VOIP service. What would be the impact if the same question if ...
-4
votes
1answer
132 views

If NSA can't decrypt TLS why don't we use it to encrypt phone calls [on hold]

If an individual can convert his voice into Internet traffic using a simple combination of hardware and software what stop governments from using it and avoid NSA spying on them? To clarify: Since ...