RTPBleed et Asterisk : les appels d’Asterisk sous écoute

Asterisk souffre d’un problème assez grave permettant à un attaquant d’écouter simplement vos conversations. Une attaque de l’homme du milieu (man-in-the-middle), sans être vraiment au milieu d’ailleurs, permet de rediriger les flux RTP assez facilement. L’annonce a été faite il y a quelques jours (31/08/2017). Il s’agit en fait d’un vieux bug datant de 2011 qui a été réintroduit au premier trimestre 2013. Le premier report annonçant la régression date de mai dernier ainsi que le patch (fournit pour test). L’annonce officielle a été faite le 31 août dernier. Quelles sont les versions vulnérables ? Toutes les versions d’Asterisk entre la 11.4.0 à la 14.6.1 sont malheureusement touchées. Dans quel cas le serveur Asterisk est vulnérable ? Quand le serveur Asterisk fonctionne avec des postes derrière un routeur NAT, il est nécessaire de mettre en oeuvre des actions afin de router correctement les paquets voix. Le protocole SIP s’appuie sur le protocole RTP afin de transporter la voix et le protocole SDP afin que les user-agents (UA) puissent négocier entre eux des éléments comme les codecs, adresses et ports. Ces éléments sont échangés en clair sur le réseau. Pour permettre ces négociations, le serveur Asterisk est configuré (fichier sip.conf) avec les options nat=yes et strictrtp=yes. De plus, ces options sont…


Asterisk is the top telephone switch system

So, Asterisk is a software implementation of a telephone private branch exchange which has the full range of what has been made for modern powerful telephone systems. This statement can be proved by enumerating some Asterisk’s available options list. Asterisk is the most trustworthy telephone exchange system because it works with not one but a number of various operators with dynamic call routing. So, in case something happens to one or more telephone operators, PBX clients won’t even feel this. In addition, Asterisk is the most profitable phone exchange system. It’s so because every single calling route is provided by a special client plan. Calls within city limits are unlimited, for instance, and are supplied by the city line. Long-distance calls made outside the city and the country limits are provided by UcallWeconn or Betamax. Finally, every single call is made with the most profitable tariff plan allowing one to save up to 80%. And eventually, Asterisk is the cheapest in sense of installation and support. For example Nortel – a telephone exchange system with options similar to those of Asterisk – Cisco and Avaya might cost up to $ 20.000-30.000. At the same time Asterisk’s installation and support is costless. The software implementation can be installed on next to…


Use Desktop Pop-up Application with Asterisk PBX

Use Desktop Pop-up Application with Asterisk PBX Reminders, alerts, pop-ups, etc. are very important in this busy running world. Multi-tasking is what all of us do and so chances of overlooking certain alerts is likely. But what if we overlook something which is really significant? Not done, right? Yes! As a result, to avoid this confusion, desktop screen pop-up was introduced. Desktop pop-up application delivers integrated web searches with GoogleMaps and GoogleSearch to locate, dial and save new contacts. Desktop popup application combines the power of the Microsoft, the power of Google, and the power of your Asterisk PBX based phone to speed up and simplify all your phone communications. Desktop applications use Asterisk AMI link to control any phone connected to a hosted Asterisk server, or control any phone connected to a Broad Soft server. Possible instant messaging and other Asterisk call notification tools you could utilize: include the following:1. smbclient (SAMBA) 2. YAC (windows & TiVo listener) 3. YAACID (open source in .NET/C#): Yet Another Asterisk Caller ID 4. Jabber (various methods), ICQ, MSN, … 5. Covide (CRM software) 6. FOP (Flash Operator Panel) 7. HooDaHek (collection of CallerID scripts and tools for Asterisk VOIP PBX) 8. App_notify network caller notification. Mac OSX client available (3rd party tool)…


Top 3 Asterisk Solutions Prosper Small to Large Scaled Businesses

In a past decade, much technological advancement noted. The technological inventions brought revolution in the people’s life as well as the businesses. One of such technological boon is Asterisk. The asterisk is a well-known PBX software, which can be attached to traditional telephone lines or voice over IP network. It comes with many flexible and rich features. Some of the key features of Asterisk are listed below: Call Monitoring Call Transfer Blind Transfer Call Retrieval Call Snooping Call Queuing Call Waiting Call Recording Conference Bridging Blacklists Whitelists Direct Inward System Access Database Integration Remote Office Support Talk Detection Three-way Calling Transcoding And the list goes on Traditionally, Asterisk was used to make calls. As businesses started recognizing the flexibility and wealth the Asterisk offers, many custom solutions were developed in Asterisk. There are many VoIP development companies, which started and continued the development of the custom Asterisk solutions to leverage the communication requirements of any business. There can be a specific solution developed by keeping an organization in mind; at the same time, there can be an asterisk solution developed, which is general in nature, and provide similar benefits in any operational environment. The top 3 Asterisk solutions which suit any business environment, and benefits it with its abundant features…


Faxing with Asterisk PBX

Faxing with Asterisk PBX In any organizations, using the latest and most advanced technologies have become a must now. And when talking about the latest technology, no organization would want to miss on the older but effective technologies such as Fax. Fax for Asterisk gives Asterisk PBX — that supports a wide range of TDM protocols for the handling and transmission of voice over traditional telephony interfaces, and VoIP packet protocols such as IAX, SIP and H.323–the ability to send and receive fax over both telephone and VoIP connections. Using Fax for Asterisk, you can send faxes from your desktop using your standard email client without any need to install any software on your desktop. It endows you with the ability to send and receive faxes to and from TDM and IP channels. It includes analog and VoIP fax capabilities to Asterisk VOIP PBX and develops fax-on-demand, fax-broadcast, desktop fax and fax gateway applications and services. Fax for Asterisk also provides 14400bps PSTN faxing via DAHDI-compatible telephony boards and T.38 fax over SIP. You can add the Fax for Asterisk software on a hosted Asterisk PBX. Features of Fax for Asterisk include the following: * Fax for Asterisk supports inbound and outbound faxes * It is an integrated SMTP gateway…


Asterisk is the best software for integration of IP-telephony-based projects.

Undoubtedly, the software was firstly created mainly or even mostly by Mark Spencer of Digium (Find out more about the history of Asterisk here.). Having released Asterisk, Mark founded Digium. Here are some Asterisk’s purposes: – Provide Asterisk’s users with the useful equipment for traditional network. Despite the fact that modern “clean” IP telephony exchange software works only with SIP, Asterisk let users connect directly to analog and digital communication. And Digium designs all the implements to make it possible (you can upload the company’s index here). – Regulate the designing of Asterisk. After thousands of users and designers around the globe have become involved in the engineering and perfecting of the software, the company’s founders had to create a administered manageable open source community. Follow the link here to find out about the community http://bugs.digium.com. – Identify and pay for the strategic plan of Asterisk’s growth. Competent programmers working in the company make this possible to achieve. Furthermore, most of the professionals and programmers came from Asterisk’s forum. Their active work on the developing of the source code that already exists and creating a new code drew Asterisk’s administrators’ attention. Digium gave away a part of its own tools to its dealers so that they could contact the software…


Bridging Skype to Business Telephony with Asterisk PBX

With outsourcing being in trend these days, talking to clients sitting in a foreign county regularly has become important. However, making calls overseas frequently is not something which is practically possible from the monetary point of view, right? As a result, Skype has come out with solutions to make our life easier and peaceful. Skype allows for low-cost calling to landlines and mobile phones and free calling to more than 400 million registered Skype users around the world using Skype for Asterisk. Skype for Asterisk provides Asterisk PBX solutions to make, receive, and transfer Skype calls.Skype for Asterisk is attuned with Asterisk 1.4, Asterisk 1.6, AsteriskNOW, and Asterisk Business Edition and supports both G.711 and G.729a calling. Skype and hosted Asterisk provide a low cost telephony options. Skype for Asterisk combines with the Skype community and provides the following benefits to its customers:Benefits of using Skype for Asterisk* Using Skype for Asterisk, you can make Skype-to-Skype calls.* It allows you to receive calls with online numbers (SkypeIn).* Using Skype for Asterisk PBX, you can make world-wide PSTN calls to landline and mobile phones. * It allows doing and receiving several parallel Skype calls from the same Skype account.* Skype for Asterisk PBX has DTMF support for incoming and outgoing calls.*…


Key Benefits That Asterisk Teems With

Asterisk is an open source software PBX utilized by umpteen enterprises, businesses and individuals alike. Asterisk is undoubtedly trenchant yet affordable software well equipped with compelling features which are hard to discover elsewhere. A lot of businesses today have started benefiting from Asterisk. Not only the smaller businesses, but it is also observed in the largest companies across the globe. For large enterprises that have locations in remote areas, using Asterisk allows offices to connect over the network. This eventually eliminates the heavy expense of conference calls that most of the companies usually face. Moreover, employees who frequently commute can sit back and stay connected to the office PBX system. There have been numerous benefits associated with utilizing Asterisk with a high quality small business VoIP solution. Let’s have a quick look at its key benefits. Easy to extend and use software: One of the most essential benefits of Asterisk is that, it is easily extensible in both a software and hardware sense. Due to its open source nature, it has nothing to obtain by forcing you to buy a specific reporting software and call management. It freely allows other applications to integrate. Compatible with various VoIP protocols:Asterisk supports numerous VoIP protocols, some of them are SIP, MGCP, H.323. Program…