VoIP

• Asterisk
• Freeswitch

• VoIP Info (Wiki)
• Bell System Recorded Announcements (from porticus.org)
• another Phone Recording Archive
• Polycom Technical Bulletin 43565 on using their phones with Asterisk.
• Info about Step-by-Step switches.

• C*NET (phone collector's network, 1-724-5364)
• e164.org (enum)
• freenum.org (1234*1234)
• inum (883-510-01-286-1109)
• sipbroker.com (*9820-9820)

• flowroute
• ip kall (free DID, heaps of channels apparently -- we use it for conference calls)
• voip.ms

• AudioCodes
• Digium
• Polycom

• ip phone warehouse