Hi Enzo,
I am not sure how osmocom's internal routing for media is set up before conversion to SIP.
If you attend my upcoming OsmoDevCall presentation on Sep 20, you will find out then. :-)
From what I have seen, if you want to connect with a landline provider/ILEC, they still expect you to be able to do interconnection for signalling and media over TDM links,
Isn't this approach cost-prohibitive? I understand what you are saying where they are required to interconnect you at cost, but isn't this "at cost" part going to be outrageously expensive still? Suppose you are physically located at a residential location, or a small office or some warehouse or whatever, and you wish to interconnect with an ILEC via TDM. What kind of physical medium are we talking about? A T1 line? But to get that T1 line installed and maintained between your physical location and the nearest ILEC facility (CO), you would have to pay the T1 line cost, which nowadays runs into at least upper 3 digits (or even over $1000) PER MONTH - not my idea of hobby budget.
which I do not believe that osmocom supports.
Implementing whatever sw support is needed would be peanuts compared to the dollar cost issue I just pointed out.
Additionally, from my reading of the documentation, osmoMSC interconnects with it's HLR and with the sip connector over it's own internal GSUP and MNCC protocols,
And what is so wrong with these interfaces? When I write my own custom software to run interconnecting gateways, implementing MNCC and GSUP on the Osmocom-facing side poses no obstacle - while the bit-level details of these two interfaces are Osmocom-specific (and very simple compared to oft-proposed alternatives!), their architectural and paradigmatic design strictly follows 3GPP specs, thus you are very much in native GSM territory when you work with these interfaces.
as opposed to sigtran or diameter, which are what I believe I would need to use for interconnection.
If you are unwilling to write your own interconnection software, then indeed your options become much more limited. When I set out on my project about a year and a quarter ago, I quickly realized that writing my own custom gateway software (from Osmocom GSM to USA PSTN via a SIP trunk) was/is the only way to achieve what I need, and 5 quarters later I am quite proud of my accomplishment. To learn more, wait till my Sept 20 presentation.
On another note, I know that you have done some research on getting access to carrier sms providers. From my reading, the major companies that provide this service are Orange, Syniverse, Arelion, Comphone, and UniFi communications (this one http://unificom.com/ss7.html, not the access point company). Have you reached out to any of them?
No, I haven't. I was initially directed to Bandwidth.com for P2P SMS (meaning access to SMS interconnect *without* being misclassified as A2P), but when I talked to BW, I was told that they require a minimum MONTHLY spend of $2500! However, the same person/company who originally told me about BW graciously agreed to act as a reseller for me (they already get service from BW, and they agreed to sublet/resell to me), and the person who runs that company is an active member of FLOSS community. If his schedule permits, he may be co-presenting with me (just on the topic of SMS, not the main voice part) on Sep 20 - but I would like to keep the rest a surprise, so please excuse me...
Also from this thread so far, I am getting an impression that you are approaching the problem of PSTN interconnection from a different angle to how I currently approach it, and you seem to know a lot of things which I am a lot less familiar with. Right now OsmoDevCall schedule is completely open - we have a meeting slot every month, but right now there is no one signed up after me. Given that you seem to know another, quite different way of getting PSTN interconnection compared to the method I will be presenting on in September, and you seem to know a lot about it, would you be willing to give your own presentation after mine? This way we can all learn from each other.
M~