Quick PSTN to PRA Question

[RCorrigan]

Scenario is a group of PSTN's needing to be migrated to PRA's.

How many should you be able to migrate ?
I.E. 120 PSTN's --> 5 PRA's

TIA

<Do I need A Signature or will an X do?>

 

[johnpoole]

that will need to be done at the co, if your rec did's on those numbers the provider will need to retarget them

john poole
bellsouth business
columbia,sc

 

[RCorrigan]

I understand that ... it was a simple maths question really ...... should 5PRA's take 120 PSTN's ??

<Do I need A Signature or will an X do?>

 

[johnpoole]

yes, unless you have killer traffic, i have 240 channels on my pri's with 10 k did's and 7000 or so users.. if your a full blown call center, no you need almost a channel per user, but most business have a 10 to 1 user to trunks ratio.. 10 to one for me would require 700 channels but with 240 i;ve never caught more then 80 per cent busy..

john poole
bellsouth business
columbia,sc

 

[hawks]

If you do not have a high call volume then you will not need all 5 PRI's. I have 2 here with about 200 numbers pointed to them and so far no problems.

 

[janaya]

You can use maybe a 6 to 1 ratio. 1 trunk port for each group of 6 pstns.

so you can use 1 PRI to handle. What you need to do is calculate the total number of people on the phone at any given time. I would not buy 5 PRI's to cover your 120 PSTN's, unless your LEC rep is promising free lunch for a year. 6 to 1 is not bad, but you could do 4 to 1.

If you have predictive dialers, for a contact center, which I doubt, if you are using POTS lines, but if you do then you could use that many pri's.

Your LEC should tell you how many you SHOULD get, but if they don't, go out on the WEB and find an ERLANG calculator to calculate the number of trunks you will need.

Hope this helps.

John

 

[johnpoole]

you could turn on a traffic report in load 2 and make sure your peak busy is not ignored with the change, your home phone is 20 to one, and has been for 50 years, and maybe 1 day a year you can't dial a ld number (mothers day)i don't think i have every hit a busy out at this site, but a hospital is less traffic then other types of business's. some of our depts are traffic intense, others are internal mostly, and patient's are more after 5 traffic

john poole
bellsouth business
columbia,sc