The yeastar tg400 connects gsm to voip networks to provide two-way communication: gsm to voip and voip to gsm.
yeastar tg400 key features
gsm voice calls
maximum cost reduction
top quality and reliability
mobile connectivity for smb
it allows you to connect most ip-based telephone systems including yeastar ip phone systems, and softswitches to a gsm which can provide a sophisticated fallback solution when landlines go down, or be used to increase call traffic capacity by providing additional dial-tone.