... Protection When choosing next generation communication equipment for IP network, cost reduction and investment protection are the main ... T.38 fax relayDTMFRFC 2833, SIP INFO, Transparent audioBillingRADIUS Interface; Polarity ReverseUser FeatureCaller ID, Call forward, Call transfer, ... concurrentMain control chassis, 2U, 2 10/100M Base-T, 1 RS232 console, 4 line card slots, AC. With 24 concurrent ...