Cisco ATA186-I2-A ATA 186 2-Port Adaptor CISCO ATA-186 Phone adapter with 2 phone ports Supports SCCP , SIP , H.323 and MGCP firmware (SCCP installed) 100v-240v power supply with detachable power cord Cisco ATA 186 with complex impedance (270 ohm in series with 750 ohm and 150 NF in parallel)