- Multi-Tech Systems
 - Provides telephony, embedded, modem, Internet security, and remote access for VOIP, socket, firewall/VPN, wireless, and more. - Mediatrix Telecom, Inc.
- Develops IP telephony products such as integrated access devices, PSTN and digital trunking gateways, PC-clients, SIP-based telephony servers, and protocol software stacks.
- VegaStream
- Providing voice over Internet protocol (VoIP) gateways.
- MERA VoIP Solutions
- Produces VoIP technologies including the MVTS Session Controller that scales up to 40K concurrent calls, supports SIP and H.323, and provides call admission control, QoS, and SLA.
- Welltech Computer Co, Ltd.
- Manufacturer of VoIP products, including SIP Proxy, IP PBX, VoIP IVR server, Billing Voip server, and VoIP recorders.
- Cisco IP Telephony
- Provides information on Cisco's line of IP telephony products.
- CpGate
- Manufacturer and exporter of IP telephony servers and gatekeepers.
- Welltech Computer Co., Ltd.
- Manufacturer of voice over IP products and systems.
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