patcat88
join:2002-04-05
Jamaica, NY
| easy to kill voip
Its very easy to kill VOIP. AFAIK, VOIP looks like alot of small packets very frequently. Drop a good % of these sub-MTU packets and you will kill any real time protocols. Non-real time protocols such as youtube, HTTP, non-live streaming video, Remote Desktop don't run into any problems since they usually buffer until they can send MTU sized packets as needed, but VOIP sends small packets to decrease latency. I've heard national Telco ISPs doing this to block "illegal" VOIP. Another idea is buffering packets by IP address together at a router also damages VOIP, and send them as a pulse to the customer. More advanced techniques would involve introducing artificial jitter to the packets.
All a cellprovider needs to do is some QOS on the T1 backhaul for some nice targeted QOS. There is a reason why EVDO has shitty upload speeds over the old network which had double or triple ping times and jitter:D |
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jaminus
join:2004-10-14
Arlington, VA
| I have very little knowledge about VoIP network behavior, but couldn't you simply write an app that "padded" packets with a bunch of garbage to the point that the the packet size was similar to that of HTTP streaming video? Or would that exceed the capacity of most 3G networks?
To me, jitter is the only sure-fire way of killing VoIP. |
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djrobx
join:2000-05-31
Valencia, CA
 ·PHONE POWER
 ·AT&T U-Verse
·AT&T CallVantage
·Time Warner VOIP
 ·RoadRunner Cable
| Jitter can be compensated for by adding a small delay (buffering). You probably can't artificially induce enough jitter to make conversing impossible without seriously impacting other types of services as well.
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jester121
Premium
join:2003-08-09
Lake Zurich, IL
 ·surpasshosting
·ViaTalk
| reply to patcat88
Hi, welcome to the thread! We're talking about using your cell phone that has Wifi built in to connect with a public hotspot and bypass your carrier's network completely. Thank you for following along!  |
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TKJunkMail
Enjoy the sun
Premium
join:2002-03-03
Avalon, NJ
 ·Sprint Mobile Broa..
·Comcast
3 edits | Using local DATA plans to make VOIP international voice calls
said by jester121  :Hi, welcome to the thread! We're talking about using your cell phone that has Wifi built in to connect with a public hotspot and bypass your carrier's network completely. Thank you for following along! And not JUST WiFi. They are looking at products that will use local wireless DATA bytes to make INTERNATIONAL voice calls using VOIP products:
Skype, the eBay (EBAY)-owned service used by more than 338 million people to make free PC-to-PC calls, later this year plans to release a new product called "Skype for your mobile" that will let customers use local wireless minutes to make international calls. And that would take big bites out of wireless providers most lucrative traffic.
...offered through Apple's iPhone App Store. Truphone is one such tool. When used on Nokia (NOK) e61 and Nokia n95 smart phones, the British-developed service lets users make calls for a few cents a minute using a data plan rather than wireless voice minutes. Calls to other Truphone customers using Nokia N-series or E-series devices are free. So in theory, a user could save money by purchasing an unlimited data plan in tandem with the lowest-priced voice plan necessary. --
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Kearnstd
Elf Wizard
Premium
join:2002-01-22
Mullica Hill, NJ | reply to patcat88
Re: easy to kill voip
why mess with the packets? the cell companies make much more money off overcharging for data then the 5,000 minutes they let people have.
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[65 Arcanist]Filan(High Elf) Zone: Broadband Reports |
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