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To do so, the use of the YEASTAR TG100 GSM VoIP gateway has been validated by our technical teams. Of course, a subscription with an operator and an associated SIM card is required. This new communication medium complements the current solution, which consists of interfacing with a SIP-compatible PBX (telephone exchange). The PBX can be a hardware solution hosted in the customer's infrastructure or a service leased from a cloud operator (in the latter case, we invite you to contact your usual contact person for more information). These different solutions require Topkapi version 6.1 or later.