4-FXS-port Analog Telephone Adapter
- Grandstream 4 port analog telephone adapter- Supports 3 REN and single 10/100M Ethernet port- LEDs for power, internet, LINK/ACT, and phone status- Advanced telephony features including caller ID, call waiting, 3-way conference, transfer, forward, do not disturb, message waiting indication, multi-language voice prompt, T.38 Fax, flexible dial plan- Support comprehensive voice codecs including G.711 with Annex I/II, G.723.1, G.729A/B, G.726, iLBC- Strong security protection of voice/data privacy using TLS/SRTP/HTTPS, secure and automated provisioning using TR069 and HTTP/HTTPS/TFTPGSHT704