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Installing and Configuring an Asterisk Conference Bridge for the NCS Club

Installing and Configuring an Asterisk Conference Bridge for the NCS Club. Konrad Armitage & Matthew Lapinski NCS 416 Prof. Ronny Bull November 21 st , 2013. Project Scope. Installation of an Asterisk server on a physical device to be used by the NCS club

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Installing and Configuring an Asterisk Conference Bridge for the NCS Club

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  1. Installing and Configuring an Asterisk Conference Bridge for the NCS Club Konrad Armitage & Matthew Lapinski NCS 416 Prof. Ronny Bull November 21st, 2013

  2. Project Scope • Installation of an Asterisk server on a physical device to be used by the NCS club • Installation & configuration of a conference bridge to allow multiple users from inside and outside the network to hold group meetings.

  3. Equipment • Dell PowerEdge 860 server • Devices for testing • Computers, cellphones etc. • Hardphones and Softphones • Headsets • Packet analyzer (Wireshark & TCPdump)

  4. Planning Stages • Setup Asterisk on physical server • Developed layout for network configurations • Work with Sys Admins to implement networking • Discuss choice between MeetMe() and ConfBridge() • Setup SIP trunk • Test abilities of the server • Troubleshoot problems.

  5. Networking and Installation • Installation of CentOS and Asterisk • Devices • Configuration files • Modules • Networking • Arrangements with CS Sys Admin • Port configurations • Setup of SIP trunk

  6. Asterisk Installation • CentOS6.4 x86_64 minimal install • Asterisk 2.6.32 from source * Initially created on NCS Club network and migrated to the 10.107.0.0 /16

  7. Solving NAT Issues on a Campus Network 1) Publicly routable address 2) DNAT on external interface

  8. DNAT Destination Network Address Translation Pre-processing alteration (doesn’t change source address) Changes the destination address to specified address Example: Asterisk server at 10.107.1.98 Packet destined for 150.156.201.22 -> Destination address changed to 10.107.1.98

  9. Solving NAT Issues on a Campus Network

  10. Firewall Rules • UDP 5060 (SIP) • TCP 5061 (SIP/TLS) • UDP 10000-10200 (RTP) • TCP 22 (SSH) • UDP 123 (NTP)

  11. Initial Testing • Internal connections successful • Could register externally but: • Inbound connections without audio • Could not initiate calls

  12. Problem Solving? • CS system administrator dropped inbound firewall rules • Inbound connections began to work

  13. SIP Trunk • With inbound connections working successfully, an outbound SIP trunk from SIP.us was created. • Free trial with 60 minutes • Outbound call successfully tested to cellular network

  14. Troubleshooting • Asterisk • Problems with MeetMe() and ConfBridge() • Incorrect port usage/assignment • Errors in configuration files • Errors between connections of outside users to internal users

  15. Concluding Thoughts • What went right? • Setup • Troubleshooting • Testing • What could we have done? • MeetMe() • IAX2 • Reduce modules loaded for efficiency • How can we build on this? • Paid SIP trunk • Publically available number • Admin settings for conference • Video conferencing • OpenSSL • Improved hardware

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