VoIP Calculations

# of Simultaneous Calls	Voice Traffic	T1 Bandwidth	Cable/DSL Bandwidth	Cable/DSL Bandwidth
Using G729	Kbs	1500	500	350
1	40	1460	460	310
2	80	1420	420	270
3	120	1380	380	230
4	160	1340	340	190
5	200	1300	300	150
6	240	1260	260	110
7	280	1220	220	70
8	320	1180	180	30
9	360	1140	140	-10
10	400	1100	100	-50
11	440	1060	60	-90
12	480	1020	20	-130
13	520	980	-20	-170
14	560	940	-60	-210
15	600	900	-100	-250
16	640	860	-140	-290
17	680	820	-180	-330
18	720	780	-220	-370
19	760	740	-260	-410
20	800	700	-300	-450
21	840	660	-340	-490
22	880	620	-380	-530
23	920	580	-420	-570
24	960	540	-460	-610
# of Simultaneous Calls	Voice Traffic	T1 Bandwidth	Cable/DSL Bandwidth	Cable/DSL Bandwidth
Using G711	Kbs	1500	500	350
1	96	1404	404	254
2	192	1308	308	158
3	288	1212	212	62
4	384	1116	116	-34
5	480	1020	20	-130
6	576	924	-76	-226
7	672	828	-172	-322
8	768	732	-268	-418
9	864	636	-364	-514
10	960	540	-460	-610
11	1056	444	-556	-706
12	1152	348	-652	-802
13	1248	252	-748	-898
14	1344	156	-844	-994
15	1440	60	-940	-1090
16	1536	-36	-1036	-1186
17	1632	-132	-1132	-1282
18	1728	-228	-1228	-1378
19	1824	-324	-1324	-1474
20	1920	-420	-1420	-1570
21	2016	-516	-1516	-1666
22	2112	-612	-1612	-1762
23	2208	-708	-1708	-1858
24	2304	-804	-1804	-1954

Why It's Tough To Find WiFi In Japanese Hotels: It's Not Needed

These days, if you're traveling in the US, it's increasingly likely that the hotel you stay at will offer WiFi -- often free. It's certainly not universally available, but many hotels have realized that it's something of a requirement for many travelers (especially business ones). However, someone who recently traveled to Japan noticed that none of the hotels he visited had WiFi (or ethernet!). When he asked someone about it, he was told that no one really needed it, since most people had mobile data service from a wireless carrier -- and since that was plenty fast and ubiquitous, it made other forms of internet access much less interesting. This is the type of story, of course, that thrills the carriers. Of course, what the story leaves out is the pricing differential. WiFi is often free. In many places, mobile broadband data services are insanely pricey. However, it does show how a decent speed and ubiquity when done right (a big if) certainly can trump higher speeds and hotspots going forward.

We're already seeing this in the US among people who are using EV-DO wireless broadband access where it's available -- and claim it's rid them of the need to use WiFi. The two technologies certainly can co-exist for quite some time. There are a variety of issues (technology, business models, interference, capacity, etc.) as to why one technology is unlikely to completely obsolete the other -- but the models will start to converge, and that's going to leave quite a few companies without much of a business model at all.

Program bypasses cookie-deleting

Corporate IT Security ALERT:

United Virtualities is offering online marketers and publishers technology that attempts to undermine the growing trend among consumers to delete cookies planted in their computers. The company unveiled what it calls PIE, or persistent identification element, a technology that's uploaded to a browser and restores deleted cookies. In addition, PIE, which can't be easily removed, can also act as a cookie backup, since it contains the same information.

SBC Rejects Vonage 911 Collaboration

Competitive fears keeping SBC from doing the right thing?

As a continuation of this morning's story on Vonage VoIP, Red Herring notes that SBC is refusing to work with Vonage on joint testing of improved VoIP 911 systems. This ZDNet columnist believes SBC doesn't want to improve the feature-set of a rival. "What might be aggressive competitive policy is not responsible social policy," the columnist opines. He's posted a follow up that includes an SBC response to his criticism.