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• SIP with firewall/NAT using Asterisk
  
  Network Address Translation (NAT) is a common practice used in networks, and it doesn't play well with VoIP. Solving this problem requires an understanding of NAT, VoIP and your VoIP setup. The following focuses on the SIP protocol for VoIP using Asterisk, but problems and solutions are applicable to most other situations.
• How do I define the CODEC which I want to use in DIDWW SIP trunks?
  
• How Can I Generate Ring Tone Using Asterisk System?
  
• How Can I add DIDWW IP Addresses To My IP-PBX System?
  
• Are the DID World Wide services compatible with Asterisk?
  DIDWW supports VoIP protocols used by Asterisk, including IAX.