... including SIP protocol, Frequency domain echo cancellation and iLBC codec;Compatible with asterisk,3CX,Yate based on IP PBX system ... Huawei, ZTE and others. It also supports network-side ISDN connections to ISDN PBXs and supports features such as Caller ID and ... /WEB Mode, Remote Software Upgrade, Alarm, Performance DataSignaling· PSTN Side ISDN PRI Standard: ANSI, NI-2, DMS, 5ESS· VoIP ProtocolSIP ...