VoIP Insider has a great little article about basic dialplan building with Asterisk. It’s worth a read if Asterisk, VoIP, or PBX with Asterisk is on your mind.

VoIP Insider is a blog from VoIP Supply.  VoIP Supply carries a variety of VoIP hardware, including Polycom SIP phones, Asterisk hardware, and pretty much any VoIP capable phone.