[Asterisk-Users] Architecture Advice

[wasim at convergence.com.pk]

On Sun, 14 Sep 2003, Chad Brown wrote:

> We have 2 offices. One is in the US and the other in India. We are
> testing Asterisk as a possible solution. Does anyone have advice for the
> preferred architecture when dealing with the latency from the US to
> India?

We're in PK, latency to US is around 300ms (not including our local-loop, 
which depending if the BRI wants to cooperate or not, ranges between 30 
and 140 ms) (so between ~300 to ~400ms latency)

* still sound bloody great... use iLBC over IAX2 (trunked if more than a
handful of calls between the two points). 

For a single call budget around 24kbps, with more trunked calls, add the
cost of the codec per call, plus a slight overhead.

> For example, although it is not a requirement to have an Asterisk server
> in India it may make sense to have one there and connect office to
> office vi IAX since I hear that it supports low bandwidth / high latency
> connections better than SIP. It would be nice to leverage the sip phone
> investment in each office.

I would put an * box as close to each end-user as possible, that'll ensure 
that atleast all their local options (menus, voicemail, AGI) are not 
"bandwidth dependent".

> I am open to any architecture and any protocol that will provide the
> best reliability and quality between the 2 offices. BTW - we do have a
> VPN between the 2 offices.

US SIP -> US * -> IAX2/iLBC -> IN * -> IN SIP

it doesn't get any better than this :)

enjoy, welcome to *

- wasim