I am writing this post because I had to read some manuals and (wrongly) send a patch email to a mailing list to learn how to actually be able to contribute with code to an Ubuntu package. If you need detailed information, please google some official documentation. But if you just want to start coding, this is your place, here you'll find the cake recipe to do it.Sign up to a Launchpad account.The only really needed information is your username and your ssh keyChoose a project. Ensemble, for example.Download the source code:mkdir ensemblecd ensemblebzr initbzr branch lp:ensemble masterbzr branch master bug-whatevercd bug-whateverCODE! Those bugs won't get fixed itself!bzr commit #goto step 6, if neededbzr pushMake your branch publicMake a merge proposalDone!Now go for it![update] another interesting documentation shared by rsalveti today: Ubuntu Packaging Guide Disclaimer: I know there's a lot of options on the market for free long distance calls like Skype, Viber, WhatsApp and so on. The goal of this personal project was all along to come up with a proof of concept that actually works, study something different other than my actual job and, why not, have some fun :) BUT, yes, there's one single use case that this setup will be useful: You're in the middle of nowhere, no internet connection and you need to call someone in the other side of the planet but you don't want to pay a long distance call: BINGO!Disclaimer2: For this tutorial you'll have to be prepared for Asterisk terminologies like trunks and channels. If you're not familiar with this vocabulary, please take a quick look at this documentation.Description of the environment: The server1 is placed on the Brazilian side. It's a Raspberry Pi model B that runs an asterisk-modded-for-raspberry-pi distro called raspbx. Attached to it there's an USB GSM dongle with a SIM card for the local Brazilian operator. In the same network of my server1 there's a Cisco PAP2t Internet Phone Adapter and, attached to it, a regular land line telephone. The same setup is duplicated on the German side, except that the Raspberry Pi is model B+.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What it does: This is the list of features that this project performs right now:Someone in Brazil calls my Brazilian number, the dongle1 answers the call, redirects to an IAX2 trunk directly to server2. The server2 takes this incoming call and uses the dongle2 to place a new call to my german cellphone. The other way is still pinned to a single phone -- like, call my dongle2 to reach a single number in Brazilian side -- but improvements are coming.Someone uses phone1 on Brazilian side to call extension phone2 on German side (and vice-versa) like a regular landline phone.Someone uses phone1 or phone2 to reach my german cellphone.Ok, so LET'S DO IT!!I'm gonna skip the PAP2t configuration because I think it's too much. This is only needed if you want to use land line telephones, it's not required for the GSM bridge. If anyone is interested in doing that, please leave a comment and I'll write a new post only for that configuration.Important