I'm looking for advices regarding VoIP products. I need to build an in-house VoIP PBX for one of my company's office, and while I'm fairly sure we will go with Asterisk (still leaving the door open to OpenSIPS), I'm not certain I want to build it myself, or buy an appliance.
We want around 30 parallel lines, and do the convertion VoIP to analog before it leaves the office (no hosted PBX or anything like that, we don't trust the network bandwidth enough, it's just a basic DSL there).
One of the requirement is to be able to customize the system. We want to plug it into our Active Directory and CRM system, extract statistics, conversation and voicemail to audio files, etc...
I've looked at Digium, they have interesting prices (cost is an issue, of course). But does it leave the door open to customization ? Do you have access to the database, the logs, the system in general ?
What else is there on the market ?
It's kind of difficult to select an answer, since I would asking for advice and not to solve a specific problem. So pardon me if I wait a little more before I award the answer to one of you.