Which GSM-Modem to build a Gateway?

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Hello and Merry X-Mas,

can someone tell me, which USB GSM-Modem I should use, if I want to
setup a “GSM-To-SIP” gateway?

I need at least 4 GSM-Modem which must be Quad-Band to work in Europe,
North-Africa and Near-East.

Thanks, Greetings and nice Day/Evening
Michelle Konzack