T1 cards attached to a channel bank. Expensive, since you’d need at least 2 ports of T1 plus at least 2 channel banks to get 35 extensions.
2 of the Digium 24-port analog cards. Again, expensive. About $3000 USD total.
Analog Terminal Adapters for each of the phones. Cheapest and most expandable way to go, but requires an Ethernet/IP connection at each phone. Some examples of the commonly used ATAs are the Cisco ATA-186 and Grandstream HT-486.
T1 cards attached to a channel bank. Expensive, since you’d need at least 2 ports of T1 plus at least 2 channel banks to get 35 extensions.
2 of the Digium 24-port analog cards. Again, expensive. About $3000 USD total.
Analog Terminal Adapters for each of the phones. Cheapest and most expandable way to go, but requires an Ethernet/IP connection at each phone. Some examples of the commonly used ATAs are the Cisco ATA-186 and Grandstream HT-486.[/quote]
Thank you so much Sir for your reply but i have another question please.
Do ATAs are the Cisco ATA-186 and Grandstream HT-486 require VOIP account ??
I don’t wan’t to use voip i want to take advantage of my Landline telephone service provider
It is better you get a trunk from some voip provider that allows dialing to mobiles and landline with minimal charge. If you use fxo card with asterisk then you can use a landline phone cable to your fxo card and dial out mobile or land line number. If landline phone provider allows calls to mobile. You can achieve this with something like this.
Remember, fxo lines are very lousy with answer and hangup detection and you will need to do some tuning and experiments. At the end I agree with david that you must ready asterisk TFOT book.
This is not needed with any currently supported version of Asterisk. Asterisk will terminate successful calls if either party hangs up, and will terminate unsuccessful ones when it runs out of dialplan steps.
To cut down price, you can use soft phones if employees have PC with mic and speaker or headphone at their desk. Least cost option is to use Voip adapters with normal telephone handsets. For example Linksys SPA8000 adapter - which has 8 FXS ports and can connect 8 telephone sets costing around 250$. Moving to voip is smart choice after all
we have a company with 20 employees, we do not mind having IP or analog phones internally, and we need to have up to 8 simultaneous lines to the outside preferably regular phone lines, what would be the best hardware configuration in terms of server (CPU, RAM, etc.), Digium card, phones, etc.? Is there anything we need to watch for, or to be concerned about as far as Asterisk is concerned with such configuration?