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The other number is the toll free number that you will see on the home page of this site. This allows me to keep calls from known callers and unknown callers seperated and prevents easy scraping of my personal number from the internet. It's been my experience that telemarketers are less likely to call other toll-free numbers; that said, I do direct calls for this number directly to voicemail. There are some exceptions to that, of course. I can write rules to redirect specific callers who use that number to my primary number which will then ring.
Finally, while not a part of my own VoIP service, I also have my work number forwarded to all of my devices as well. It goes straight to voicemail outside of working hours, but it does allow me to work from home or from the road, if necessary. All of my other numbers actually turn to voicemail overnight as well, so I don't have to worry about muting my phone or completely ignoring calls.
All Devices For Any Number
So, all of the numbers can be answered from one VoIP device, but what device is that? Why choose, I say. There is, of course, several SIP clients for Android that can be used to receive VoIP calls. The nice thing about using everything over data is that my phone doesn't stop working when I lose signal, so long as I still have access to Wi-Fi. This also means that I don't actually need to have a SIM card in my phone at all. This is useful because I actually have a second, identical Nexus 5. The battery is terrible, so I can always have one charging. They sync automatically, so it doesn't really matter which one I pick up except that I will need the one with the SIM card if I'm going to stray from Wi-Fi.
But I was just mentioning that I don't want to be locked to any one interface, so the same interface on a second device isn't really an improvement. Again, because it only relies on the internet, not a specific cellular network, I can just as easily connect on basically anything with a network connection. SIP applications come in all forms, including for smartphones, all desktop operating systems, tablets and embedded systems. My primary calling device is actually my ThinkPad running Debian with Linphone. I have the same setup on my desktops at work and home.
Despite there being a GUI application for Linphone, I like commandline tools, so I actually use that most of the time. This means that I could just as easily place and receive calls without loading a desktop. While I haven't taken this to an extreme yet, I have thought about setting up a Raspberry Pi inside an old fashioned phone to use at home as well, or perhaps setting up a couple of omni-directional mics around my appartment so that I could have ubiquitous speakerphone. If I end up doing this, I'll certainly document it, but for now I enjoy standing at my desk with my extendable mic arm and studio headphones for most calls.
So. That's talking, which is the simple part. The nerdy bit comes with SMS. The number of ways that I could send or receive a text message is verging on silly. The obvious place to start is still the text messaging app on my phone. I went with a VoIP provider that already had a third-party one in the Play Store. That is the least interesting and enjoyable way to do so though, since the keyboard is small and is always trying to correct my spelling.
This section is now actually sort of dated. As described below, my VoIP service provides an easy SMS to Email tool which I had hacked to allow a variety of ways to interact inbound and outbound. All of them are still possible and I actually do still have the emails coming in to be archived, but I have improved the other methods of interaction. But here is the old techniques if you are curious.
This functionality is exactly what it sounds like. When I receive a message, a copy is sent to me as an email. It, of course, uses a special mailbox but I run my own mail server, so I have the VoIP service whitelisted to guarantee delivery and reroute the mail wherever I like. Of course, if I reply from any of my email clients, that reply will be sent out as an SMS.
I also have my emails archived using my spam filter, so if my mail server is down I can still reply from there and I can even enforce filtering rules if I feel like it. If I don't want texts from area codes other than my own I can just block them, for example. Of course, that doesn't stop them from making it to my phone, but I don't actually look for messages on my phone very often.
The great thing about email is that it just lands as raw text on the mail server. You can do absolutely anything you want with raw text, so this is where it gets nerdy. My favourite way to answer text messages is IRC. I got addicted to IRC at the office where we use it for everything: generating support tickets based off of caller display from inbound calls, alerts for new email tickets, vacation schedules, meeting call reminders, and just to chat and ask questions with colleagues. As a result, I always have an irssi window open and have alerts set up whenever my nick is mentioned.