Hi Mychaela,

Yes, I think it is correct to call the SMSC address a GT. In the IR.21 document of operators it is also listed as a GT AFAIR.

Cheers, Domi

08.08.2023 dátummal, 8:28 időpontban Mychaela Falconia falcon@freecalypso.org írta:

Hello fellow developers,

I am getting ready to implement my own SMSC, connecting to Osmocom CN via GSUP (see OS#6135), and I have a question about SMSC address terminology.

In traditional commercial GSM networks, the SMSC address visible to the user (prepended to the TPDU for MT SMs, stored in EF_SMSP record on the SIM for MO SMs) looks like a phone number in full international format, with TON=1 and NPI=1. For example, T-Mobile's SMSC address is +12063130004 (to an uninitiated eye it looks exactly like a regular phone number in Seattle, WA), while the SMSC of Mexican Telcel is +5294100001410 - one digit longer than regular phone numbers in Mexico, and a little irregular in structure.

What is the correct term for these SC-address phone-number-thingies? Are they Global Titles - or is GT something different?

If I were to make up fake global-looking SMSC addresses of this form, e.g., something like +1xxx55501xx for NANP territory, would it be correct to call such SC-address a fake Global Title?

Just wondering...

M~