[Asterisk-Users] 32 E1's in one Asterisk 'box'

[steve at daviesfam.org]

On Wed, 11 Jan 2006, janvb at caselaboratories.com wrote:

> hi,
> 
> Thanks - I was hoping someone who had done this would pop-in.
> 
> Do you treat each Asterisk server as a separate entity or do you have a 
> sentralized Asterisk that perform call-control for all etc? How do you 
> make them behave as one, or is this not needed?
> 
> Also, do you switch voice from B-channel's on one server to the 
> B-channel's on another? In case how do you do this? SIP w/rtp/rtcp, 
> TDMoE or ?
> 
> Do you have any measurement of latency etc?

Hi Jan,

This site is a specialised outbound call centre (/me ducks).  They all 
behave as one because the custom dialler application that runs on each 
server all talk to a single core database.  Similarly, we don't register 
agents/SIP phones using SIP registers.  Instead, their presence is 
captured in the database.  When a server has a call and needs an agent it 
looks for the next free in the central database.

We don't switch calls from PRI on one box to another.  If I did, I would 
surely use an IAX2 link.

Latency has never been an issue and I've never measured it.  Rest assured 
that IAX2 on an Ethernet adds very little latency - I'd guess 20msec 
packetization delay, the wire latency (5ms).  So unless you have a special 
requirement you certainly won't make a latency that humans will notice.

Steve