Q

Does the phrase 64 simultaneous calls on a T mean 64 extensions?

Does the phrase "64 simultaneous calls on a T" mean 64 extensions? How about the trunk lines? If there are 24 channels, can I use 24 ntrunk lines from the carrier?

Does the phrase "64 simultaneous calls on a T" mean 64 extensions? How about the trunk lines? If there are 24 channels, can I use 24 ntrunk lines from the carrier?
By "64 simultaneous calls", it means the number of calls that can be sent down the available 1.544 Mbps bandwidth of a T1.

Trunk lines are converted to bandwidth. It is not possible to use 24 ntrunk lines from the carriers. Simultaneous

calls are dependent on the codec used. A T1 could theoretically carry 80 calls and an E1 could carry 107 calls at g729a and can therefore accommodate 64 calls. So, an IP PBX with 160 extensions may have a contention rate of 8:1 (extensions to trunks). This would normally require 20 channels of an E1 or T1. In bandwidth terms, this equates to 380 kilobits.

This was first published in June 2006

Dig deeper on IP Telephony Systems

Pro+

Features

Enjoy the benefits of Pro+ membership, learn more and join.

Have a question for an expert?

Please add a title for your question

Get answers from a TechTarget expert on whatever's puzzling you.

You will be able to add details on the next page.

0 comments

Oldest 

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

SearchMobileComputing

SearchNetworking

SearchTelecom

SearchITChannel

SearchEnterpriseWAN

SearchExchange

Close