| Quad Band GSM 4x Gateway 4 channel GSM Voip gateway Open Standard VoIP Protocols (ITU H.323 V4 and IETF SIP V2)Single or Multiple Server RegistrationsTwo 10/100 Ethernet circuits connect to the LAN and an additional deviceGSM module for making GSM callsSpeech quality ensured by QoS at the Ethernet and IP layers and comprehensive jitter bufferVLAN and QoS supportNAT Transversal and Router functionsVoice prompts, HTTP Web, Auto Provision support for configuration and updatesHighly stable embedded Linux operating system in high performance ARM 9 Processor | 
