Are there any guidelines for determining how many phone lines to order? Let's say we have 80 users. Right now, we have 80 analog phone lines. In a VoIP world, to match that, I'd need to order 4 T1s if I want to be able to support everyone on the phone at once.
But in a typical office environment, not everyone is on the phone at once. Are there any formulas/guidelines telco's use to help size how many phone lines you should order?
I realize of course it all depends on the profile of your users. Call centers might need 100% capacity. But in a standard office, I'm guessing more like 60%? Anybody have any examples they've used?
Just to add a note to the good info from my friend Rajesh :)
The old telco rule is called the "1 in 10" Trunking rule. 1 Trunk/Channel per 10 users.
You can always engage your service provider to do a Traffic Study that will also include busyhour averages in your current setup. It is probably good to be over-trunked rather than under-trunked, especially with an Enterprise environment. So in your case this would equal 2 PRI's if you wanted Failover support as nicely noted by Rajesh.
1 Trunk (in your case channel) per every 10 users, so
100 users = 10 channels
200 users = 20 channels
You can also use RTMT to monitor your PRI's and send you email alerts when defined thresholds have been exceeded.
As you can see this is not an exact science for example;
For our Student Residence we use 5 PRI's for 1000 student phones.
For our Staff we use 4 PRI's for well over 2200 phones.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.