Is there a rule of thumb or formula to find out how many PSTN lines do you need without getting inbound or outbound busy signals. The phones will replace users' existing phones in a campus environment. All lines will have DID numbers and all calls will have to go in and out of the PRI gateways excluding IP-IP calls. I'm looking at 200 lines.
Well if you are already using a legacy PBX, then why not calculate the current ratio of internal PBX stations to outside trunk channels, and use that as a starting point for the ratio to use with your IP telephony installation. There are various ways you can found out if users are experiencing busy signals.
We are a centrex customer of Bellsouth so we do not have a PBX on campus. Our current pilot deployment has about 55 phones and 48 lines (2 PRI) and I still get some OutBoundBusyAttempts on my DT-24+. Any idea why?
you should try to get traffic reports from Bell South for your busy hour. If you can't get any info you could use a standard 6ccs per user with a GoS of .01 and calculate the number of Erlangs required. Then go to a Erland B table to find PSTN lines. Make sure you factor out the station to station traffic. Internal traffic of 20% is a good assumption.
Look at Cisco's ICS7750 Site and Network Design Guide, Chapter 5 for a good explaination of telephone traffic.
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The short answer is that you don't.... That isn't entirely true while at
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...