Cisco ATA 191, G.711Mu, G.711a, G.726, G.729A, G.729ab, T.38, UL 60950 Second Edition, CAN/CSA-C22.2 No. 60950 Second Edition, IEC 60950-1:2005 (Second Edition)..., CE Markings per directives 2014/30/EU and 2014/35/EU, SIP, TCP, UDP, RTP, HTTP, ARP, RTCP, ICMP, LLDP