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Elastix Application Note #201110031: Trunking between two Elastix PBX Systems Via VPN

Title Trunking between two Elastix PBX Systems Via VPN Author Bob Fryer Date Written 3rd October 2011 Revision 1.0 Replaces Document N/A Tested on Elastix Version 2.2RC3 Backward Compatible Yes – See notes Disclaimer: Your use of these application notes is subject to the following conditions: ExperiencedElastix Level Beginner to * Your Linux Level application of these notes are entirely at your own risk. Not required * While tested in a Lab environment, I know nothing of your environment and may be totally unsuitable. Network Level hold myself or any company I am associated with responsible for any damages arising from these notes. It is up to you to Intermediate to Experienced * You will notLatest test in your environment to its suitability. Document Source available from www.elastixconnection.com Credits N/A Licence GNU FDL

Foreword
These application notes are intended to be a guide to implement features or extend the features of the Elastix IP PBX system. Finding information on the Internet can be haphazard due to the lack of document version control, lack of attention tosoftware versions, and in some cases they are wrong. Then you have the cross pollination issues, where a guide has been done for another distribution, which may or may not be applicable to your Elastix system. You will table on the front page of every Application Note written released in this way, will be an easy to read summary, regarding the Elastix system it was tested on, when the document waswritten, whether it is backward compatible, and the level of expertise needed to accomplish the implementation. These application notes are written up and tested in a lab that has been specially setup to write these notes. This includes • • • • • • 5 x Elastix IP PBX Hardware with a mixture of SIP only, Digium, Sangoma, OpenVox Cards 1 x WAN Simulator (including latency, jitter, random disconnects,random packet drop) 8 x Consumer / Business routers, including Drayteks, Cisco 1842, Cisco 877, Linksys WRT54GL 2 x IBM XSeries servers running VMware with 8 images of various versions of Elastix IP PBX 1 x Standard Microsoft SBS Network providing DHCP and DNS and Mail system 2 x Linux Servers

The Elastix IP PBX systems, both hardware and Virtual based have image systems to refresh the systemsto limit infection from other testing. Combined with a range of Phones, which include Aastra, Linksys, Cisco, Yealink, it provides a reasonable cross section of typical systems currently in the field. These application notes are not just done in isolation either. Behind them is over 6-7 years of commercial implementation of IP PBX systems, utilising these methods and concepts. The Lab is just usedto reconfirm the implementation in a less production like environment. How you use these application notes is entirely up to you. However, it is highly recommended that in the first instance, that you follow the notes and configurations in their entirety (except for IP addresses) of course. If you follow it exactly, then it will be easier for others to assist you when you do have an issue. Sowhy do I write these guides?? Basically it's my way of giving back to the Open Source Community which I have done since 1998 (or earlier). Similarly, the Elastix product is a great product with a great crew behind it, and fantastic community supporting it as well, and these guides are away of imparting knowledge, to make someone's life a little easier.

Disclaimer: Your use of these applicationnotes is subject to the following conditions:
* Your application of these notes are entirely at your own risk. * While tested in a Lab environment, I know nothing of your environment and may be totally unsuitable. * You will not hold myself or any company I am associated with responsible for any damages arising from these notes. It is up to you to test in your environment to its suitability....