2 Asterisk Servers Linked together via VPN, One Server receives sms request via IVR, it sends the request to other Server.
The Other Server completes the request by sending sms request using Huawei USB modems to the GSM networks.
You will need to know how to use Asterisk usb modems to send sms to Gsm networks.
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If modems are supported by asterisk/chan_dongle i can see no problems setting up dialplan for your project. Can do it also using Nexmo or other http api.
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