Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations derfloh on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
How many trunks do I need? 1
- Thread starter aau2
- Start date
- Thread starter
- #3
-
1
- #4
- Thread starter
- #5
Hi,
Is this what you are after...
Estimate the traffic per user e.g. 0.1 Erlangs (user is on the phone 6 min in every hour), then put in the number of users 1,000 then calculate the number of lines... answer=116.1
That's with a blocking probability of 0.01 so 1 call in a 100 will fail during the busy hour, if you increase this you need less lines.
has more info
Regards
Isinor
Is this what you are after...
Estimate the traffic per user e.g. 0.1 Erlangs (user is on the phone 6 min in every hour), then put in the number of users 1,000 then calculate the number of lines... answer=116.1
That's with a blocking probability of 0.01 so 1 call in a 100 will fail during the busy hour, if you increase this you need less lines.
has more info
Regards
Isinor
Ten to one is a reasonable starting point if costs are not a factor to the PBX owner, otherwise, that is a multi-faceted question......
What are the anticipated calling patterns of the users? IOW, what type of business is it?
What are the ratios of incoming to outbound calls?
For outbound, local vs toll traffic?
What types of trunking services are available?
What are trunking costs for the area where the PBX is located.....if services are expensive, the customer may have to accept a higher probability of blocking if the budget is tight......however that needs to be weighed against the potential cost to the user of those calls that are blocked.
How easy is it to have the service provider add more if you have too few?
Lots to consider.....good luck,
Dave Strang
What are the anticipated calling patterns of the users? IOW, what type of business is it?
What are the ratios of incoming to outbound calls?
For outbound, local vs toll traffic?
What types of trunking services are available?
What are trunking costs for the area where the PBX is located.....if services are expensive, the customer may have to accept a higher probability of blocking if the budget is tight......however that needs to be weighed against the potential cost to the user of those calls that are blocked.
How easy is it to have the service provider add more if you have too few?
Lots to consider.....good luck,
Dave Strang
- Status
Similar threads
- Locked
- Question