ADSL2/2+ Router Vigor2800V

Protocol : SIP, RTP / RTCP Six SIP registrars G.168 line echo-cancellation Jitter buffer (125 ms) Voice Codec : G.711A/? law , G.726, G.723.1, G.729A/B, VAD/CNG FAX/ MOdem Support : G.711 pass-through T.38 for Fax Supplemental Services : Call Hold / Retrieve Call Waiting Call Transfer Call Forwarding ( Always, Busy and No Answer ) DND ( Do Not Disturb ) Hotline ISDN loop-through ISDN on-net / off-net