Friday, December 18, 2009

To trunk or not to trunk – this is the question

SIP Trunking that is…

Let’s analyze the options for a feature VoIP deployment. We have three basic starting points:

1. A small to medium business which currently have POTS as telephony solution (large enterprises are “large” partially because they have seen the light well back in the time and are VoIP already :-))
2. Enterprises that already have local PBX (VoIP or PSTN)
3. Any size business that have hosted VoIP

Georgia Military College failed in the first category – each endpoint directly connected to a Centrex PBX, served by the local phone company. The service, however, was “provided” by the GTA (Georgia Technology Authority – a State agency created with the idea to negotiate the best rate/services with the local Phone Providers and provide high quality services… Really?!?). So, we had a service charge of $23.60 per line, and that is – for the simpler service one can imagine, very close to what Alexander Bell invented. Want Caller ID – no problem, add $14,60 to the service charges – you get my point. Our IT office had 4 lines/numbers which rand on 10 phones simultaneously. Great productivity environment, right? Anyway, it was a “saver” – 10 phones and only 4 lines charged ($94.60). This year, however, the State of Georgia awarded the contract to AT&T, which in return immediately announced “price reduction from $23.60 to $16.00” just… now would be per ENDPOINT. So, the new MRC for the IT office would be… $160.00. Wow!!!

Let’s dissect this. We have NPA.NXX.XXXX where NPA are the area codes, NXX are the Exchange codes (remember, PBX = Private Branch Exchange) and finally XXXX which is the local number within the local Exchange. So, the number 478-445-4705 translates to Area Code = 478, Exchange Code 445 (a PBX located in the office of WindStream in Milledgeville, GA) and extension = 2705 (terminated on mine (and 9 others) desks. When I call 478-225-2706 (another former GMC number), what actually happens is my call gets to the PBX (WindStream office) where a match is found, a digital relay is closed and the copper pair that goes in to my phone is connected to the copper pair that ends in to another phone in the office next to ours. Well, it is a little more complicated than this but… you get the picture. So, we are paying for the ability to connect one termination point to another (even if they are few feet apart).

Now look the tricky part. XXXX equals to 10,000 (the maximum numbers of extensions) i.e. 0000 to 9999. A call within the range is “local” i.e. never leaves the PBX. Because it is internal, there is no problem since the PBX was designed with THIS capacity i.e. 5,000 users on one end of town pick up the phone and call the other 5,000 located in the other part of town. So far, so good.

Let’s look what happens when I dial OUTSIDE my local exchange. WindStream (in Milledgeville) holds the following NPA.NXX: 478 414; 445; 451; 454; 456; 457; 804 i.e. when I dial 478-452-XXXX, the local Exchange (still within WindStream’s infrastructure) will find the matching pair and connects me. Now, if you think WindStream have10,000 copper pairs between each PBX in order to cover (the alleged demand) i.e. all 10,000 users of 478.445.XXXX will dial all 10,000 users of 478.452.XXXX, and another 10,000 copper pairs between 478.445.XXXX and 478.453 .XXXX just in case, you are wrong. There is much “thinner “cable with way less number of copper pairs. Why? Because telephony is like Health insurance – a big gamble with the odds that LESS people will get sick while ALL insured will pay their premiums thus payments for service will be made and profit will be generated at the same time. And here the term TRUNK comes in use. The gamble here is that less people will dial OUTSIDE the local exchange than a pure “local” call. Same rule apply to calls outside the NPA i.e. Long Distance calls.

How this translates in to our situation? GMC have 220 telephone users in Milledgeville campus.
1. Business Office (everyone in the Educational area knows what the BO does – talks on the phone most of the time.)
2. Faculties (in class most of the time), doing “phone business” mostly returning voice mail calls
3. All others

After a long research, I went with a ¼ ratio i.e. one trunk line per every four phone users. Because OCS is now our local Exchange, we should not account for the “internal calls” – GMC user to GMC user but rather OCS - >PSTN and PSTN -> OCS. I got lucky; it worked perfectly for our situation. For the eight months of EV, our logs showed not more than 10 (ten) calls rejected due to “exceeding the trunk capacity” i.e. more than 40 people (our current number of concurrent calls in Milledgeville) attempted to use our SIP trunk (connection with the PSTN network).

A concurrent call trunk with our provider (more in the next post) carries MRC of… $13.00 and so, the total (fixed – your CEO will love this) cost for our Milledgeville campus - $520.00 per month. Can I have Amen?!? A campus with 500 Middle/High School kids and their teacher, 2,500 students and their faculties plus the Business office, Admissions, Alumni etc. for $520.00 a month?!? Can I have Amen again?

More about our journey is to come in the next few days.

62 comments:

Captain Nemo said...

Amen, Drago!!!
And congratulations.

This is very well done. Better solution for less money. Of course that's not going to make everybody happy - in particular the fat cats of the old ways ;)

Francois

MerleLamothe said...

Thanks for the blog.Thanks Again. Awesome Tutuapp

Jimmy Joes said...

Great Information, Thanks For Share Tutuapp

Anonymous said...

The best iOS helper | It's Available for both Devices iOS and Android | Quick Install Tutuapp Free {Latest} Version 2019 Also Tutuapp VIP Check it. Also You Can Download Snaptube For PC

Abid said...

download oginsta plus

4liker said...

4liker apk

Anonymous said...

igameguardian ios

Brawo said...


Top ModedBazar Mod Apps free Latest versio for Android, iOS and PC.

Download BlackMart APK
Freedom APK Download
DJ Liker APK Download
Pokemon sun moon Apk

Unknown said...

punjabi movies

Anonymous said...

Hotmail Iniciar Sesion

Nina Dobrev said...

Thanks for sharing this informational blog. tutuapp

Aptoide Game said...

Aptoide is a great app for ios, through which any app or application can be downloaded to free on ios device. We will download you for Aptoide iOS on our site. From here you can easily download it.

The http://www.aptoideapkx.com/aptoide-ios/ device uses its own operating system. ios users use iOS stores to download the app. The Aptoide App has all the application data, which is not on the iOS store. In this post, we tell you how you can use Aptoidefor ios and how to download it for your ios device. We will download Aptoide For iOS, iPad and other iOS devices. This app is completely free and it is not taken in any way by any monthly/yearly charge. This app is a third-party app store that allows you to download thousands of millions of apps. Aptoide APK is specially designed for the Android user, but you can also use it for the ios device. It works on all kinds of devices.


Aptoide Game said...

iOS devices. This app is completely free and it is not taken in any way by any monthly/yearly charge. This app is a third-party app store that allows you to download thousands of millions of apps. Aptoide APK is specially designed for the Android user, but you can also use it for the ios device. It works on all kinds of devices.

aptoide ios

Anonymous said...

wedding photographers indore

fiki said...

Excellent post. I definitely appreciate
this website. Continue the good work!


apoweredit crack

parapc001 said...

visit the site here.

werwer said...

iMyFone LockWiper Registration Code is often a professional encryption tool foriOS passwords. It offers two methods for end users to entry Apple ID and decrypt passwords relating to the laptop computer. It's got an easy-to-use operating system, main to varied problems that include iPhone deactivation and second-hand iOS app lock failure. End users could obey the prompts to accomplish the step-by-step unlock password.

humayun saeed said...

What wonderful and unique information, I am happy to learn something new from you. Well done and keep going.
macrium reflect crack
dune 2 vst crack
folder lock crack

malik shoaib said...

Also, your website loads up very fast
spotify cracked
playnite portable crack

John said...



iMyFone LockWiper Registration Code is often a professional encryption tool foriOS passwords. It offers two methods for end users to entry Apple ID and decrypt passwords relating to the laptop computer. It's got an easy-to-use operating system, main to varied problems that include iPhone deactivation and second-hand iOS app lock failure. End users could obey the prompts to accomplish the step-by-step unlock password.
بهنام بانی

فرزاد فرخ

unknown said...

Download Crack Softwares


https://shahzifpc.com/

unknown said...

Download Crack Free Software

https://letcracks.com/

werwer said...

Bluesoleil Serial Number can be an all in one prominent and great software that handles the bond among some choice of laptop computer together with the Bluetooth equipment available it. There's loads of programs, and BlueSoleil supplies a system intended to effortlessly focus on the help readily available on the subject of the linked hardware. Communicating

software cracks said...

I absolutely love your blog and find the majority of your posts to be just what I’m looking for.
Would you offer guest writers to write content to suit
your needs? I wouldn’t mind composing a post or elaborating on a lot of the subjects you
write in relation to here. Again, awesome weblog!
mnsoftware cracks

farhan said...

if you want to download the latest version of this softwares links given below!

UltraISO Crack
vMix Crack
FrostWire Crack
ApowerEdit Crack

babarrao said...

Hello, I'm delighted to notice some excellent content on your website.
Do you want to come back to my site later? Posts, comments, and communities on my site are comparable to yours.
coolutils total mail converter crack
system cleaner crack
avg pc tuneup crack

G said...

I went to your website. I admire you and your efforts. I appreciate your efforts.
If you're looking for the most recent edition and what's new, you've come to the right place.
I hope you find this website useful. Thanks.
gb whatsapp crack
internet download manager crack
fabfilter total bundle crack

Shoaib Amin said...

I love the design and design of your site.
Summer is very easy on the eyes, making it much more comfortable for me to come here so many times.
Have you ever hired a stylist to design your theme? Works extraordinarily!
microsoft office 2019 crack
driver booster pro crack
fl studio crack
movavi slideshow maker crack

Hafeez Shah said...

Your website is fantastic. The colors and theme are fantastic.
Are you the one who created this website? Please respond as soon as possible because I'd like to start working on my project.
I'm starting my blog and I'm curious as to where you got this from or what theme you're using.
Thank you very much!
adobe photoshop cc crack 2
movavi video editor crack
zonealarm pro antivirus and firewall crack
wondershare mobiletrans pro crack

LATEST CRACK PATCH said...

Thanks for Sharing such an amazing article. Keep working... Your Site is very nice, and it's very helping us.. this post is unique and interesting, thank you for sharing this awesome information Easeus Partition Master Crack

Cracked Softwares said...

Nice information. I’ve bookmarked your site, and I’m adding your RSS feeds to my Google account to get updates instantly. Driver Genius Key Crack

Shoaib Boss said...

Thank you for your time and effort and also for the depth of your posts.
the information you provide.
It's nice to come across a blog that doesn't repeat the same old things every time.
I really liked this book!
I've bookmarked your site and added your RSS feeds to my subscriptions.
A Google account is required to use this service.
heat up 2 vst crack
origin pro crack
movavi video editor key
office tab enterprise crack
movavi photo editor crack

Keygen Patch Softwares said...

Cool Edit Pro Full Version Crack
Bitdefender Total Security Key
BitTorrent Pro Crack
Anno 1800 Crack
Voicemod Pro Crack
Virtual DJ Studio Crack
IObit Software Updater Pro Crack
ESET Internet Security Crack
f1 crack
AnyToISO Crack

Cracked Softwares said...

Nice information. I’ve bookmarked your site, and I’m adding your RSS feeds to my Google account to get updates instantly. CCleaner Pro Crack

LATEST CRACK PATCH said...



Thanks for Sharing such an amazing article. Keep working... Your Site is very nice, and it's very helping us.. this post is unique and interesting, thank you for sharing this awesome information crackspro.co

safu said...

Your writing abilities are genuinely remarkable.
I also admire your writing abilities.
artisteer crack
macromedia flash Crack
malwarebytes anti malware crack
kaspersky internet security crack

Unknown said...

I saw your writing skills. Your writing skills are amazing. I also really like your ability to write.
Your writing skills have given me a lot of perspective on this subject. I think you're an old blogger.
apfs for windows crack
mixxx crack
spark crack
n track studio crack
windows 10 pro crack
hard disk sentinel pro crack
mirillis action crack
quarkxpress crack

crackspro said...

Thanks for sharing such an amazing post. Great Work. Love visiting your blog. I would like to thank you for sharing this post. Really Happy to Read. PingPlotter Pro Key

https://programsasvirtualespc.net/ said...

Wonderful Content
Autodesk 3ds Max Crack
MAGIX ACID Pro Crack
CCleaner Professional Crack

Keygenstore.com said...

Sincerely, I am so glad I found your site, I accidentally found you while searching on google
for something else, I am still here and I want to congratulate you on a nice post and
a nice blog all over (love the theme/design too),
I don't have time to watch anywhere in the minute, but I noticed and added
your RSS feeds, so if I have time, I will return to
read on, keep up the good work.
itools full crack
youtube music downloader crack
trojan killer crack
magix movie edit pro crack
stamp seal maker crack

Nikfury said...

Let me express myself. I think your site has browser compatibility issues.
It shows you the location without any problems, but Internet Explorer has some overlapping issues.
In fact, I just want you to know what happened. Only this is the best blog!
ipvanish crack
adobe dreamweaver crack
windows 8 activator crack
malwarebytes anti malware crack
comodo antivirus crack

freeforfile said...

Windows 10 Activator Extreme is a tool that locates manufacture and retail keys in many servers for Windows 10 with a broad range of scatterings. Bit by bit, the Keys are regularly recovered.
Windows 10 Activator
windows 11 activator
Windows 7 Ultimate Product Key
windows 8.1 product key

Crack Start said...

Thanks for an informative blog. The other location
Could I have this kind of information written?
Ideal way? Ideal way? I have a company I've just begun operating on and I've been looking forward to
Such information.
ByteFence Anti-Malware Pro license key
Microsoft Office 2010 Free Download Full Version
The Sims 4 Keygen Crack Serial Key Generator
System Mechanic Pro Crack Keygen Free Download 64 Bit

procrackkeys said...

iobit Driver Booster Pro crack 2022

Crack Expert said...


Wow, amazing block structure! How long
Have you written a blog before? Working on a blog seems easy.
The overview of your website is pretty good, not to mention what it does.
EaseUS Partition Master Crack Free Downloard
Avast Internet Security Crack Free Downloard

tenshion na lo sb phra jao ga said...

this is amazing site thanks for sharing
ACDSee Video Studio Crack

https://maccrack.net/ said...

Thanks for supporting us. Parallels Desktop Torrent is a strong
competitor of virtual machine ware and workstation users.

Anonymous said...

https://softactivators.com/
Your blog is very supporting us. We have regularly reading your blog.
This software allows matrix manipulations, plotting of data and functions.

https://softexiacrack.com/ said...

Thanks for supporting us. Are you finding best software for accounting in your business field?
If yes i have a software that can definitively help you to do this work more easy.
https://softexiacrack.com/
This software is known as Tally Prime Release Crack. It is the world best management tool for business.

Anonymous said...

Your blog is very supporting us. We have regularly reading your blog.
Vysor Pro Crack is a great tool for controlling your Android device from your computer.
Through this software, you can view and control your Android phone on a PC.
https://crackedwin.com/
You can use apps, play games, mirror screens, and manage movies, contacts, music,
and other files using your mouse.

https://crackedfull.org/ said...

Windows 10 Activator helps a person to activate in a minute where use can the full advantages by the windows. The different process was required to use this activator but this activator helps the personal computer users to avail plenty of facilities from office to home.

Anonymous said...

Your blog is very supporting us. We have regularly reading your blog.
This is a powerful software for video creation. A user can easily able to
edit the videos using this software. It also creates videos in a professional way.
https://crackfullstore.com/

Cracked Software said...

https://softsreal.com/
I read your Blog. Excellent film editor for the producer of the filmmaker.
This program is making the amazing movies in cinema history.
Some movies are hit in cinema history like King of the world, Heat,
King Kong, Jurassic Park, Terminator, etc.

Cracked said...

https://macxpro.com/
Your blog is very supporting us. TeamViewer’s far-off association cloud stage
empowers secure distant admittance to any gadget, across stages, from anyplace, whenever.
TeamViewer interfaces PCs, cell phones, workers, IoT gadgets.

Unknown said...

vnc-connect-enterprise-key

Unknown said...

Adobe Acrobat XI Pro Crack

Unknown said...

refx-nexus-crack
Matt johnson

Unknown said...

data-recovery-wizard-crack
MHAPHILIAS

Unknown said...

NoorCracks
Webroot Keycode

serials bank said...

serials bank

NoorCracks said...


serials bank
serials bank
Ad-Aware Pro Security Crack


GA BACKPACK
GA BACKPACK
Cubase Pro 12 Crack

iTOP VPN Crack said...

iTOP VPN Crack is a network apparatus that permits you to change your location, keep you connected to the Internet, and also search and browse. The iTOP VPN hides your IP discourse and keeps your data confidential on the Internet. https://profullkeys.com/itop-vpn-license-key-crack-download/