... be linked with 8 RJ11 telephone ,change your SIM singal to fixed telephone.3.Caller ID display ,can preset IP,preset ... Bulk SMS Software can be bulit in (slective !)Basic function of the gsm sim box: 1)It ... or call out times3) It can connect with ordinary telephone set, PBX , VOIP Gateway, Billing meter etc.; ... by setting up from telephone set;9) SIM card supported (1.8V, 3V);8) Caller ID display;9) DTMF ...