Pure voip asterisk

While reading the asterisk book I noticed the only package required for a pure voip conection is asterisks.

This means I would not have to install libpri or zaptel or anything else?

I’m using voip and would rather use asterisk and the sound module. Less complications I guess.

Or is it recomended to install the other modules? like libpri and zaptel.

Thank you.

All you need is Asterisk.

I have a pure VoIP system. However, I needed to install zaptel and the addons to get music-on-hold working. I haven’t used libpri though. You’ll also need the addons if you want to talk to MySQL.

Thanks, I noticed for some reason it’s not all that stable by itself. Thanks for the reply.