Home > Ask the Networking Experts > Infrastructure and project management Questions & Answers > Catching illegal VoIP
Ask The Networking Expert: Questions & Answers
EMAIL THIS

Catching illegal VoIP

Carrie Higbie EXPERT RESPONSE FROM: Carrie Higbie

Pose a Question
Other Networking Categories
Meet all Networking Experts
Become an Expert for this site


Digg This!    StumbleUpon Toolbar StumbleUpon    Bookmark with Delicious Del.icio.us   


>
QUESTION POSED ON: 08 September 2005
It is illegal in India to connect VoIP to PSTN lines, but some criminals have done this to carry out illegal trade. Sometimes they are caught by the authorities here and sometimes not. Could you explain how they are tracked down?

>
Any company that provides a circuit has the legal ability to "snoop" the packets to determine their contents. That is not to say that ISP companies snoop all packets and decode their contents, but where the routing protocols and software allow, the type of packet can be determined. For instance, it is easy to determine which packets are voice and which are data simply by looking at the prioritization level of the packet or by looking at the IP port in which the packet expects to communicate between the end station and the sending device. Newer VoIP technologies set an application level tag inside the packet to help the network determine priority and type of service. Routers can be queried to determine which devices are sending which types of packets simply by running a report on a network management system with that capability. Bandwidth managers are a good example of this type of software. Packeteer has a great whitepaper on network prioritization. Being able to throttle back data and prioritize voice is a function of this software. In order to do this, each packet has to be examined. If tracked and stored, a simple report is all that is needed to determine the device and routing path.


Digg This!    StumbleUpon Toolbar StumbleUpon    Bookmark with Delicious Del.icio.us   



RELATED CONTENT
Infrastructure and project management
Where is Carrie Higbie's most recent advice?
What is the maximum length of attenuation for twisted pair cables?
What is the document flow of enterprise-level network consulting?
What cable do I install for a Nortel wireless access point?
Can my router configure devices into a LAN environment?
BICSI separation requirements between cross-connect points
What is the length of a ScUTP and TERA cable run?
How does asynchronous transfer mode differ from existing network technologies?
What standards specify flame retardant cable jackets for Europe?
What licenses allow user access to applications on the server?

RELATED RESOURCES
2020software.com, trial software downloads for accounting software, ERP software, CRM software and business software systems
Search Bitpipe.com for the latest white papers and business webcasts
Whatis.com, the online computer dictionary



Search and Browse the Expert Answer Center
Search and browse more than 25,000 question and answer pairs from more than 250 TechTarget industry experts.
Browse our Expert Advice



Expert networking advice and tips for IT professionals
About Us  |  Contact Us  |  For Advertisers  |  For Business Partners  |  Site Index  |  RSS
SEARCH 
TechTarget provides technology professionals with the information they need to perform their jobs - from developing strategy, to making cost-effective purchase decisions and managing their organizations' technology projects - with its network of technology-specific websites, events and online magazines.

TechTarget Corporate Web Site  |  Media Kits  |  Site Map




All Rights Reserved, Copyright 2000 - 2009, TechTarget | Read our Privacy Policy 		  TechTarget - The IT Media ROI Experts