Voicemail and ISDN gateway

Hello,

First, sorry for my english and my newbie's questions.

I look everywhere to find a ISDN gateway. It's exist ?
If not, do you know a PSTN gateway free on linux that allow at least 6 lines.

I have one other question, it's about the voicemail.
I want to be able to call a number and hear the messages. It's possible ?
Now, i just have a email with a wav in attachement.

Thanks for all and have a nice day,

Thomas D

ps: Es ce qu'il existe une liste de diffusion sur vocal en francais ? 
(Somebody know if it's exist a french mailing-list for voval ?)
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