New Asterisk Deployment

Gurus,

I’ll be doing a new Asterisk deployment soon, and would like to gather your thoughts.

Here are some items that need to be kept in mind:

Support 800 phones (200 of which are analog)
Concurrent calls … ? but need to guess high so that the server can handle this.
Voicemail will be required along with sending voice mail attachments to email server.
Flash panel for switchboard operator.
Needs to be a distributed server design for redundancy and fail-over.
Will need to be integrated into an existing PBX until each building is switched over to use the Asterisk servers.
If calling 911 from a building among multiple buildings, how can EMS find that person based upon the call?
What type of data line should be used in this setup? T1?
The physical network will support QOS and the like, so that is not an issue.

What type of design/setup do you recommend for this? How about server resources…ie…CPU, RAM, Disk space.

How about backups? Does imaging work best if a server were to fail?

Any thing else you can think of?

Matt,

I saw your posts on the -users list and in the irc chat. There are a lot of unknowns in your setup which we can’t give many specific recommendations but I will try to give you some hints.

[quote]Support 800 phones (200 of which are analog)
Concurrent calls … ?[/quote]
For the analog, you probably want to look into an analog gateway such as an Audiocodes MP124-FXS or another similar device depending on where the endpoints are. They run roughly about $1300-1400 each and you’d need 9 of them to support the 200 analog lines. Each device supports 24 ports.

For the number of channels concurrent channels you want you can look at one of the calculators at erlang.com/calculator/ to determine the channels needed.

You never specified whether your connection to the PSTN is via T1’s or a SIP provider. Will you have mostly a mix of inbound/outbound calls, or mostly outbound?

Asterisk Supports this.

[quote]
Needs to be a distributed server design for redundancy and fail-over.
Will need to be integrated into an existing PBX until each building is switched over to use the Asterisk servers. [/quote] This is up to you or the person doing the implementation to design. Designs will vary based on the level of redundancy you require and the budget.

If the buildings are large enough to warrant its own server, maybe retain 1 analog circuit for 911 purposes for the on-prem server…

[quote]
What type of design/setup do you recommend for this? How about server resources…ie…CPU, RAM, Disk space. [/quote] I guess this depends on the overall design and what the servers will be doing.

Hope this helps.