... ports, TR069 CPE management & monitoring protocols and a base stand for vertical positioning. . Up to 2 concurrent VoIP calls . Real ... 1~2 FXS ports VoIP CPEwelcome to visit our website for more details , www.flyingvoice.comPicturesG502N Specifications Voice CodecG.711 ( ... conference, Music on hold, Call hold/forwarding/mute/transfer/waiting Caller ID and CWCID, DTMF Relay- In-band, Out-band and SIP ...