Up to 4 Analog Ports Support for a Combination of FXO and FXS Modules Echo Cancellation 512 MB Onboard Flash 64 MB Onboard RAM 1 Ethernet Ports LED:Red for FXO & Green for FXS Size:193x153x30 mm Weight:500g Power:12V,1A Protocol:SIP(RFC3261) DTMF:RFC2833, SIP INFO, In-band Codec:G.711 A/u-law, G.726, G.729A/B, GSM, Speex, H261, H263, H264 Dial plan BLF Status Updates Language:English,Chinese,Portuguese,Spanish,Russian,Hebrew,Turkish

Auto-provision Blind Transfer Call Detail Records(CDR) Call Forward Call Parking Call Recording Call Pickup Call Routing Call Transfer Call Waiting Caller ID Direct Inward System Access(DISA) Do Not Disturb(DND) Interactive Voice Response (IVR) Music On Hold Music On Transfer Ring Group Route by Caller ID Three-way Calling