Call switching and services include virtual interfaces, transparent line extension, regular expression based call routing and number manipulation, number blocking, short-dialing, digit collection, distribution and hunt groups, and fallback routing
H.323v4, SIPv2
DTMF in band and out of band
Supports Caller ID FSK and ITU V.23/Bell 202 generation
Programmable AC impedance, feeding, ring and on-hook voltage