Hello Paul
Is the Sail product free whilst it is in development and presumably £249 for 1-20 license once its stable?
SAIL is free to anyone who wants to download it. For our corporate customers we offer a support subscription (very similar to Redhat) which is charged on a per seat basis.
Is there a demo site?
We have our own demo systems, as do our distributors and resellers (UK and Australia). There is no "public" demo system but corporately, we often remotely bring prospective customers onto our demo rigs to demonstrate various aspects of the system. At any one time we will be running 5 or 6 such "extended" demos.
Is it mult-tenant (I'm guessing not at the moment) and if so how much would that cost
We call multi-tennant "clustering". We have had the initial cluster support running for some time in development and the first useable out will be available in 2.1.14 which we will deliver into beta later this week. Essentially it allows you to run partitioned or virtual pbx's under a single (or networked) asterisk image. Each cluster can have access to its own VOIP accounts, extensions and ZAP lines. 2.1.14 clustering is by no means complete but we think it's OK for a first out. We've developed it in response to a strong demand in our market for a managed office type solution.
Hope this helps
Kind Regards
Selintra