1.32 channels gsm gateway call termination, 2.32 sim cards, 3.SIP Gateway, 4.850/ ... /1900Mhz, 5.IMEI Change. 32 Ports GSM Gateway,gsm gateway call termination The interface board of the HTG-3232 is 32 ... machine.(5) Caller ID.(6) Caller ID hidding and incoming call block.(7) Voice adjustment of calling in and out, multi ... linkage SMA antenna connector 32 Ports GSM Gateway,gsm gateway call termination