... MGCP gateway 3,compatible with Asterisk, Elastix, 3CX sip e1 gatewayBIG series VoIP gateway is a smart and ... RADIUS billing interface, and more magnificent featuresAdvanced VoIP technologies including SIP/MGCP protocols, iLBC, and voice encryptionIntelligent and rich in features ... Interface, 2nd Stage Dialing, and DTMF. BIG series support SIP and MGCP, and is an ideal gateway for VoIP connection ...