Did a little digging and this might be a decent starting point! https://www.mundoopensource.com.br/en_page_xmpp_asterisk_pratical_example/
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If I understand what I’ve read, you may be interested in a SIP software called asterisk. It may do what you’re looking for.
That's a nice little board! Web search SIM7600X finds various code you can use. Idk if asterisk can support it directly though.
Another possibility might be to use a consumer mobile phone I guess.
I wonder if there might be a 5g version of the board sometime.
Very strange line from specs.
USB Driver Windows XP/7/8/10/11, Linux (driver free on Raspberry Pi Raspbian system)
Does it mean binary blob driver only? and you need to pay for it to use it on PC?
I think it means that on Linux, no driver is needed ("driver-free" = free of drivers) since it uses the kernel USB stack. On windows there may be a USB driver that gets loaded. But you're right, it's ambiguous.