Amazon.com: AVM Fritz!Box 7590 International Modem Router, Wireless Veloce AC+N 2533 Mbit/s, Telefonia Analogica, ISDN e VoIP, Base DECT, Media Server, Bianco/Rosso, (Verifica compatibilità con la tua Linea): Industrial & Scientific
Prestige 100 IH Plus (A/B | Manualzz
VoIP Gateway with 2 BRI/2 FXS-FXO or 4 BRI/4 FXS-FXO ports + 4-8 simultaneous G.722/G.711 or 4-8 T.38 calls | SmartNode 4150 from Patton
Introduction to ISDN Prepared by Mehdi Kereshteh Payam