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GSM Gateways - VoIP Supply
https://www.voipsupply.com/voip-gateways/gsm-gateways
A GSM gateway for connecting GSM networks to VoIP networks for two-way communication. The TG200 is ideal for connecting IP Phones, soft switches, and IP-PBX's to GMS network, and is the best...
VoIP GSM Gateways | VoIP 3G Gateways | VoIP 4G Gateways | Yeastar
https://www.yeastar.com/voip-gsm-gateway/
Yeastar TG Series VoIP GSM Gateway connect GSM o 3G or 4G to VoIP networks to provide two-way communication: GSM/3G/4G to VoIP and VoIP to GSM/3G/4G.
VoIP GSM-шлюзы GoIP
https://www.goiprussia.ru/gsm-goip/
VoIP GSM шлюз GoIP 32 с поддержкой до 32-х GSM-каналов и протоколов SIP и H.323. GSM VoIP-шлюз, под 1 SIM-карту, 2 х RJ45 (WAN и LAN), Переадресация вызова с GSM...
VOIP GSM GATEWAY - Hypermedia Systems
https://hyperms.com/voip-gsm-gateway/
HG-4000 Modular VoIP GSM Gateway for IP-PBXs with 4 up to 32 GSM ports that use standard SIP and H-323 protocol.