Hi everyone!

Welcome to the latest edition of your pseudo-monthly JMP update!

In case it’s been a while since you checked out JMP, here’s a refresher: JMP lets you send and receive text and picture messages (and calls) through a real phone number right from your computer, tablet, phone, or anything else that has a Jabber client.  Among other things, JMP has these features: Your phone number on every device; Multiple phone numbers, one app; Free as in Freedom; Share one number with multiple people.

The JMP team is growing.  This month we added root, whom many of you will know from the chatroom.  root has been a valuable and helpful member of the community for quite some time, and we are pleased to add them to the team.  They will be primarily helping with support and documentation, but also with, let’s face it, everything else.

The account settings bot has a new command for listing recent financial transactions.  You can use this command to check on your auto top-ups, recent charges for phone calls, rewards for referrals, etc.  There is now also a command for changing your Jabber ID, so if you find yourself in a situation where you are changing for any reason you can do that yourself without waiting for support to do it manually.

This month also saw the release of Cheogram Android 2.10.5-2.  This version has numerous bug fixes for crashes and other edge cases and is based on the latest upstream code which includes a security fix, so be sure to update!  Support for TOR and extended connection settings has also been fixed, a new darker theme added, and UI tweaks to recognize that messages are often encrypted with TLS.

To learn what’s happening with JMP between newsletters, here are some ways you can find out:

• The chatroom remains the heart of the community.  You can also join from your web browser or from Matrix.
• The blog, where you may be reading this. Can also be followed in a client like Movim.
• The Lemmy Community
• The Subreddit
• On Twitter

Thanks for reading and have a wonderful rest of your week!

A few months ago we launched International calling with JMP.  One of the big tasks leading up to this launch was computing the rate card: that is, how much calls to different destinations would cost per minute.  While there are many countries in the world, there are even more calling destinations.  Our main carrier partner for this feature lists no fewer than 59881 unique phone number prefixes in the rates they charge us.  This list is, quite frankly, incomprehensible.  One can use it to compute the cost of a call to a particular number, but it gives no confidence about the cost of calls in general.  Many items on this list are similar, and so I set out to create a better list.

My first attempt was a simple one-pass algorithm.  This would record each prefix with its price and then if a longer prefix with a different price were discovered it would add that as well.  This removes the most obvious effectively-duplicate data, but still left a very large list.  I added our markup and various rounding rules (since increments of whole cents are easier to understand in most cases anyway, for example) which did cut down a bit further, but it became clear that the one-pass was not going to be sufficient.  Consider:

1. +00 at $0.01
2. +0010 at $0.02
3. +0011 at $0.02
4. +0012 at $0.02
5. +0013 at $0.02
6. +0014 at $0.02
7. +0015 at $0.02
8. +0016 at $0.02
9. +0017 at $0.02
10. +0018 at $0.02
11. +0019 at $0.02

There are many sets of prefixes that look like this in the data.  Of course the right answer here is that +001 is $0.02, which is much easier to understand than this list, but the algorithm cannot know that until it has seen all 10 overlapping prefixes.  Even worse:

1. +00 at $0.01
2. +0010 at $0.02
3. +0011 at $0.02
4. +0012 at $0.02
5. +0013 at $0.02
6. +0014 at $0.02
7. +0015 at $0.03
8. +0016 at $0.02
9. +0017 at $0.02
10. +0018 at $0.02
11. +0019 at $0.02

From this input we would like:

1. +00 at $0.01
2. +001 at $0.02
3. +0015 at $0.03

So just checking if the prefixes we have so far are a fully-overlapped set is not enough.  Well, no problem, it’s not that much data, perhaps I can implement a brute-force approach and be done with it.

Brute force is very slow.  On this data it completed, but as I found I kept wanting to tweak rounding rules and other parts of the overlap detection the speed became really problematic.  So I was searching for a non-bruteforce way that would be optimal across all prefixes and fast enough to re-run often in order to play with the effects of rounding rules.

Trie

As I was discussing the problem with a co-worker, trying to speed up lookups we were thinking about trees.  Maybe a tree where traversal to the next level was determined by the next digit in the prefix?  As we explored what this would look like, it became obvious that we were inventing a Trie.  So I grabbed a gem and started monkeypatching things.

Most Trie implementations are about answering yes/no questions and don’t store anything but the prefix in the tree.  I wanted to be able to “look down” from any node in the tree to see if the data was overlapping, and so storing rates right in the nodes seemed useful:

def add_with(chars, rate)
    if chars.empty? # leaf node for this prefix
        @rate = rate
        terminal!
    else
        add_to_children_tree_with(chars, rate)
    end
end

But sometimes we have a level that doesn’t have a rate, so we need to compute its rate from the majority-same rate of its children:

def rate
    # This level has a known rate already
    return @rate if @rate

    groups =
        children_tree.each_value.to_a         # Immediate children
        .select { |x| x.rate }                # That have a rate
        .combination(2)                       # Pairwise combinations
        .select { |(x, y)| x.rate == y.rate } # That are the same
        .group_by { |x| x.first.rate }        # Group by rate
    unless groups.empty?
        # Whichever rate has the most entries in the children is our rate
        @rate = groups.max_by { |(_, v)| v.length }.first
        return @rate
    end

    # No rate here or below
    nil
end

This algorithm is naturally recursive on the tree, so even if the immediate children don’t have a rate they will compute from their children, etc.  And finally a traversal to turn this all back into the flat list we want to store:

def each
    if rate
        # Find the rate of our parent in the tree,
        # possibly computed in part by asking us
        up = parent
        while up
            break if up.rate
            up = up.parent
        end

        # Add our prefix and rate to the list unless parent has it covered
        yield [to_s, rate] unless up&.rate == rate
    end

    # Add rates from children also
    children_tree.each_value do |child|
        child.each { |x| yield x }
    end
end

This (with rounding rules, etc) cut the list from our original of 59881 down to 4818.  You can browse the result.  It’s not as short as I was hoping for, but many destinations are manageable now, and thanks to a little bit of Computer Science we can tweak it in the future and just rerun this quick script.

Hi everyone!

Welcome to the latest edition of your pseudo-monthly JMP update!

In case it’s been a while since you checked out JMP, here’s a refresher: JMP lets you send and receive text and picture messages (and calls) through a real phone number right from your computer, tablet, phone, or anything else that has a Jabber client.  Among other things, JMP has these features: Your phone number on every device; Multiple phone numbers, one app; Free as in Freedom; Share one number with multiple people.

This month marks the first release of the Cheogram Android app we have been sponsoring.  This app is a fork of the excellent Conversations, and will stay close to upstream going forward.  Some of the improvements relevant to JMP users include:

• Add contacts without typing @cheogram.com
• Integrate with the native Android Phone app (optional)
• Address book integration
• Messages with both media and text, including animated media
• Unobtrusive display of subject lines, where present (such as on voicemails)
• Links to known contacts are shown with their name (improves group text UX)
• Show timestamps for calls
• Missed call notifications

All of these features have been built in a standards-compliant way and do not rely on anything particular to Cheogram or JMP at all, so they could be reused with other gateways as well.  You can also get the app from F-Droid.

In other news, we’ve heard for some time that some users want to try using JMP from Matrix.  Since we are so big on bidirectional gateways, we have decided to add support for signing up with JMP using a Matrix ID.  This should be considered an alpha test at this time, and most notably voice does not work with the gateway yet so you will need to use SIP (or forwarding) for voice if you use a Matrix ID.  SMS, MMS, and Voicemail will all be delivered to Matrix just as they are to Jabber.  For this we are using the excellent gateway instance at aria-net.org.  To get started, just head to JMP.chat, choose a phone number, and select “I am a Matrix user” on the next page.

To learn what’s happening with JMP between newsletters, here are some ways you can find out:

• The chatroom remains the heart of the community.  You can also join from your web browser or from Matrix.
• The blog, where you may be reading this. Can also be followed in a client like Movim.
• The Lemmy Community
• The Subreddit
• On Twitter

Thanks for reading and have a wonderful rest of your week!

Art in screenshots is from Pepper & Carrot by David Revoy, CC-BY. Artwork has been modified to crop out sections for avatars and photos, and in some cases add transparency. Use of this artwork does not imply endorsement of this project by the artist.

A big part of the vision of Sopranica, and Cheogram in particular, is bidirectional gateways.  A bidirectional gateway is one that allows (at a minimum) any user of either protocol to contact any user of the other protocol without creating an account.  This is not possible with all protocols, but works well when both sides are federated.

Simple Example

Take for instance sip.cheogram.com, which is a bidirectional gateway between XMPP and SIP.  Any federated Jabber ID can communicate with any federated SIP URI with no configuration at the gateway.  This is possible because every valid SIP URI is assigned a Jabber ID of the format xmpp:user\40domain.tld@sip.cheogram.com and every Jabber ID is assigned a SIP URI of the format sip:user%40domain.tld@sip.cheogram.com.

Contrast this with irc.cheogram.com, which is not a bidirectional gateway even though IRC is an open protocol, due to the non-federated nature of that protocol.  While every IRC channel and nick is given a Jabber ID, not every Jabber ID can be given a channel or nick on every IRC network out there, and even to do it on a single network would require creating many connections or a special peering arrangement.  Using the Jabber ID assigned to an IRC channel may require registering a nick with that IRC network and configuring the associated password at the gateway.  It works well enough, and is quite useful, but it’s not bidirectional.

User Experience

One of the big advantages of a bidirectional gateway is the seamless user experience for those who know the gateway exists.  Instead of asking “is this room bridged to protocol X” or “do you also have an address on protocol Y” the existance of the bridge is sufficient to know that, yes, with no extra setup by either party, communication will be possible.  One does not need to convince users to switch to the favored protocol, or bend by creating an identity with the other’s favored protocol, but simply to add the other party directly.  Users with Jabber IDs can advertise how they may be contacted via SIP, SMTP, Matrix, SMS, and more without the other party thinking anything more than “this address looks a bit long”.

Raising the Whole Network with Chaining

Because a high-quality bidirectional gateway effectively makes one network out of two networks, any service or gateway added to either network can be used from both sides.  Thus, Matrix, SMTP, or even SMS users can get phone numbers from JMP.  Even further than that, a Matrix user could advertise an SMTP or SIP contact address using the Cheogram gateways, all without any SMTP or SIP gateway needing to exist for Matrix at all.

Stable Addresses

If someone is going to give out an address that goes via a gateway, they need confidence that this address will not need to be changed.  So long as their main address on their preferred protocol remains the same, so should their address on other protocols.  This requires a stable DNS name with gateways that are open to anyone, free of charge.  That is the vision behind Cheogram, an infrastructure project inside of Sopranica to maintain stable addressing for bidirectional gateways.

Conclusion

Obviously there is still lots of work to do. Most of the gateways mentioned in this post are missing important features they could have in order to facilitate more seamless communication.  Clients of every protocol can gain features to make using a bidirectional gateway a more obvious choice for users.  Unique use cases need more testing to find where the rough edges are.  Cheogram infrastructure is supported in part by JMP, but can always use financial support.  Together we can help people connect to all their contacts.  Come join us.

Hi everyone!

Welcome to the latest edition of your pseudo-monthly JMP update!

In case it’s been a while since you checked out JMP, here’s a refresher: JMP lets you send and receive text and picture messages (and calls) through a real phone number right from your computer, tablet, phone, or anything else that has a Jabber client.  Among other things, JMP has these features: Your phone number on every device; Multiple phone numbers, one app; Free as in Freedom; Share one number with multiple people.

Today JMP turns 5 years old!  We launched on this day in 2017 with a fairly basic set of features: bidirectional Canada/USA SMS and MMS, with incoming calls directed to a pre-existing phone number.  Since then we’ve kept pushing further and further toward feature-parity with the most popular mobile phone number providers, adding outgoing calls, international texting, and group texting.

We have been actively testing the final piece of this work, international calling, and are pleased to announce today that we made it!  With the addition of international calling, which is available to all JMP users as of right now, we are now phone-feature-complete.

What does this mean?  In short, we now support all the features that other providers of mobile phone numbers support: bidirectional MMS (including group texting), domestic and international SMS, and domestic and international calling.  So if you or your friends have been waiting to try JMP until we finished all these features, now is the time to get the word out and try it!

On top of international calling, we now support using as many minutes per month as you like (with 120 Northern America minutes worth of credit included by default) - see our new comprehensive pricing page for details.

You may be wondering: Where do we go from here?  Well, we still have much work to do, and many more newsletters like this one coming up to let you know about it!  There are two main areas of work left:

First, we want to keep our finger on the pulse of telephony, specifically making sure that we add any features that mobile carriers are adding to their phone numbers, like RCS.  If we find such a feature supported on at least Android and iOS, we’ll get it into JMP as soon as possible (for RCS, the rollout is limited, and only on Android so far - if you know of other phone number features we’re missing, reply to let us know!).  Also, we have not forgotten about the many kind requests we’ve received for JMP numbers outside of the USA and Canada.  Those are on our list!

Second, we want to make JMP as easy to use as possible.  There is still much work to do here, particularly on simplifying signups, adding and managing contacts, and group texting.  We want to make sure that group text threads are easier to follow, which requires a little bit of development work yet.  And we are actively working on improving the Cheogram app that many of you have started using on Android, to include these fixes and an easy way to signup for JMP.  In the not too distant future you’ll be able to install the Cheogram app, pick a JMP number from the app, and start using it right away.

In other news, Dino 0.3 has been released which brings with it voice calling features compatible with those used by Converations, Snikket, Movim and JMP! It’s still early days and so there may be some compatibility issues, but reports say the features are working for people.

Lastly, as part of JMP’s 5 year anniversary, we are unveiling our new logo today too!  You can check it out at the usual places, such as https://jmp.chat/ and elsewhere.  Our old logo (which is still live at its old location for the nostalgic) has served us well for the past half decade, and we appreciate all it’s done for us.  The new logo reflects how increasingly close we’re getting to JMP being easy to use for the average person, and hopefully our approachableness.

As always, we’re very open to feedback and would love to hear from you if you have any comments, questions, or otherwise.  Feel free to reply (if you got this by email), comment, or find us on any of the following:

• The chatroom remains the heart of the community.  You can also join from your web browser.
• The blog, where you may be reading this. Can also be followed in a client like Movim.
• The Lemmy Community
• The Subreddit
• On Twitter

Here’s to many more years of JMP!

Hi everyone!

Welcome to the latest edition of your pseudo-monthly JMP update!

In case it’s been a while since you checked out JMP, here’s a refresher: JMP lets you send and receive text and picture messages (and calls) through a real phone number right from your computer, tablet, phone, or anything else that has a Jabber client.  Among other things, JMP has these features: Your phone number on every device; Multiple phone numbers, one app; Free as in Freedom; Share one number with multiple people.

We have made a deal with Snikket CIC to include their Jabber hosting as an option for all JMP customers.  Anyone with a paid-up JMP account may get an instance hosted by Snikket CIC at no extra charge.  Your Snikket instance will be covered by your usual JMP monthly subscription.  This will eventually be the default option for new users without a Jabber ID as part of our signup flow.

Many customers have asked us how they can use more than the included 120 voice minutes each month.  Starting soon, JMP will let you pay for as many minutes as you want, and along with this will be coming outbound calls to international destinations as well.  Note that users still paying with the old PayPal system will not be able to access more than the included 120 minutes or international calls, so now is a great time to make the switch.

We have already published what the initial calling rates will be, so go check that out to get an idea of costs.  Once the new pricing goes live, we will convert the 120-minute limit into a dollar equivalent that will give you 120 minutes to the USA and Canada, but will also allow you to use that included limit to cover international calls if you prefer (or a combination of both).

Speaking of costs, we know a concern for many people is getting billed for more overages than they can afford.  Of course, JMP being pre-pay helps with this a little, but if you want to pre-pay for many months and know you won’t accidentally burn up the credit, what can you do?  We have implemented a per-calendar-month overage limit system where you decide the limit.  The default for all customers is $0/month for now (so you would continue to pay the same amount every month, with no overages), but you can raise your limit using the plan settings command in your account settings so that you can take advantage of these upcoming features.

To learn what’s happening with JMP between newsletters, here are some ways you can find out:

• The chatroom remains the heart of the community.  You can also join from your web browser.
• The blog, where you may be reading this. Can also be followed in a client like Movim.
• The Lemmy Community
• The Subreddit
• On Twitter

Thanks for reading and have a wonderful rest of your week!

The Soprani.ca project, and Cheogram in particular, is pretty big on bidirectional gateways.  The most popular Cheogram-hosted instance, so popular that it gets to own Jabber IDs on cheogram.com, is a bidirectional gateway to the telephone network.  How is it bidirectional?  Don’t you need a Jabber ID to use it?  Of course not!

Sending a Message

From any SMS-enabled device, add +12266669977, which is the gateway’s phone number.  Send the following SMS:

/msg someone@server.tld Hello!

The user with Jabber ID someone@server.tld should shortly receive your message.  If they reply, what you see will depend on their relationship to the gateway.  If they have a backend route set (such as JMP, Vonage, or Twilio) then you will get an SMS from their associated phone number.  If not, you will get a message from the gateway’s number like this:

<someone@server.tld says> Oh, fun!

Joining a Chatroom

An SMS user can also join exactly one chatroom at a time.  Send this to the gateway’s number:

/join someroom@conference.server.tld

You should receive a message with the current list of participants, after which you will start seeing messages sent to the room.  After this point, any SMS send to the gateway’s number that is not a valid command (such as /msg) will be sent to your joined room as a message.  You can send /help at any time to get a list of other commands for leaving, setting your nickname, etc.

Making a Voice Call

To call a Jabber ID, first enter it into this form then dial one of the access numbers and follow it up with the extension generated by the form.

The extensions are often very long, so the easiest way to dial them on Android is to create a contact with a phone number of the form:

+access_number,*10816etc

If you have trouble with one access number, try another one.  If the Jabber ID you wish to call is very long some access numbers may time-out waiting for you to dial all the digits.

Hi everyone!

Welcome to the latest edition of your pseudo-monthly JMP update!

In case it’s been a while since you checked out JMP, here’s a refresher: JMP lets you send and receive text and picture messages (and calls) through a real phone number right from your computer, tablet, phone, or anything else that has a Jabber client.  Among other things, JMP has these features: Your phone number on every device; Multiple phone numbers, one app; Free as in Freedom; Share one number with multiple people.

This month we launched a full rewrite of our website.  While this rewrite was mostly precipitated by changes at our primary carrier partner, we managed to get a few improvements in there as well.  First of all, the search box on the homepage now accepts more than just area codes: a city then comma then two-letter state or province code is accepted, as well as zip codes or vanity patterns (like ~woof or ~1234).  This search is also now powered by XMPP commands in the backend, so you can now get a JMP number entirely without ever visiting the website, just talk to cheogram.com and send register jmp.chat to get started.

Next, our community has been testing more features in the pre-release Cheogram app.  This app is available to anyone who wants to test it by coming by the chatroom and asking for access.  When the app is a bit more ready, it will be released on F-Droid, hopefully in Q1 2022.  The big new feature right now is dialer integration.  This allows anyone using the app with cheogram.com added to their contacts to head to their native Android dialer and visit Settings > Calls > Calling accounts in the menu.  From there it should be possible to enable the calling account associated with your Jabber ID and then dial out directly from your native Android dialer app over JMP!  Any questions about this feature or the Cheogram app in general should be directed to the chatroom.

As our community grows it makes sense to reach more people where they are at, and not just hang out where we are most comfortable.  This month the freedomware project we sponsor and rely on, Sopranica, is opening two more venues where you will be able to get news from JMP or discuss the project generally: Lemmy and Reddit.  Here is the new complete list of official ways to communicate with our community:

• The chatroom remains the heart of the community.  You can also join from your web browser.
• The blog, where you may be reading this. Can also be followed in a client like Movim.
• The Lemmy Community
• The Subreddit
• On Twitter

Thanks for reading and have a wonderful rest of your week!

This blog is powered by XMPP. That means it is federated over the Jabber network, it has a Jabber ID, and you can subscribe to it using a supporting Jabber client. One such client with support for subscribing, liking, and commenting is Movim. There are several public Movim instances including one hosted by upstream and one by chatterboxtown. Once you are logged in with a Movim instance, you can follow these steps to discover this blog and subscribe.

1. Click Explore

   

2. Click

   

3. If blog.jmp.chat is not yet known to this instance, you can use the search box to add it

   

4. After entering blog.jmp.chat in the search box and hitting enter, you may need to click away to any other Movim page and then come back to the Communities Servers area as before.

5. Click

   

6. Click

   

7. Click

   

8. New posts from the blog will now show up under News

    

Hi everyone!

Welcome to the latest edition of your pseudo-monthly https://jmp.chat update!

In case it’s been a while since you checked out JMP, here’s a refresher: JMP lets you send and receive text and picture messages (and calls) through a real phone number right from your computer, tablet, phone, or anything else that has a Jabber client. Among other things, JMP has these features: Your phone number on every device; Multiple phone numbers, one app; Free as in Freedom; Share one number with multiple people.

The biggest announcement this month is the launch of our new inbound voice and SIP account system! Due to changes at our major carrier partner, all inbound call handling had to be rewritten and the SIP accounts some people use are moving to a new server with a new server name. As part of this rewrite you can now use the configure calls command to set call forwarding to any XMPP, SIP, or tel URI without involving support. If you haven’t used the JMP bot before, you do so by sending a message to your cheogram.com contact with the text of the command you want to run. You can send help for a list.

If you have not tried it yet, now would be a great time to try our features allowing calling from your Jabber account. All your regular SMS contacts can be called as well with no changes on your part, from any client that supports voice calls. Inbound calls can be routed to your Jabber ID using the configure calls command.

If you still need a SIP account for some reason (such as to use with a device that does not support Jabber calls) you will need to use the reset sip account command to get a username and password on the new server, as the old server will be going away soon. Be sure to use UDP as the transport!

In other news, our founder Denver Gingerich (ossguy) has returned from his leave and is rejoining us in day-to-day operations. You will see him more often in the chatroom and sometimes answering support.

There has also been a bit of movement on the mobile app front. We have been partially sponsoring development work on the now-released Snikket iOS which is now our recommended client for all iOS users. When paired with a Snikket server this client should receive calls and messages reliably, and also supports DTMF (entering digits for phone menus) during calls.

We’ve also had a volunteer working with us to clean up some of the features in our prototype app for Android. Not many visible changes yet (except for a much better icon to open the DTMF pad) but watch this space for updates.

As always, if you have any questions, feel free to reply to this email or find us in the group chat per below. We’re happy to chat whenever we’re available!

To learn what’s happening with JMP between emails like this, here are some ways you can find out:

• find us in xmpp:discuss@conference.soprani.ca?join - a group chat accessible from most XMPP clients, and on the web: https://anonymous.cheogram.com/discuss@conference.soprani.ca
• signup at https://jmp.chat and try it out!

Thanks for reading and have a wonderful rest of your week!