SN4171/1E15VHP/EUI	SmartNode VoIP GW, 1 E1/T1 PRI, 15 VoIP Calls NOT upgradeable, or 15 SIP-SIP calls (SIP b2b UA) upgradeable (max. 200), High Precision 5ppm Clock, optional SIP-TLS, SRTP, 1x Gig Ethernet, 1x USB port, external UI power (100–240 VAC)