Dyad Group, s.r.o. Czech Republic
- International VoIP Wholesale Provider
- Internet Telephony Service Provider
- Voip consulting
- Consultancy Services
- Installation and Support Services
- IP devices
- SIP VoIP Gateway
- System Integration
- Cisco Systems
- Vegastream
- IP Phone
Session Initiation Protocol (SIP) is a text-based standard put in place by the Internet Engineering Task Force (IETF) and is the primary protocol for Voice over Internet Protocol services. SIP is similar to a MGCP in that it's a signaling protocol that can create, maintain and terminate sessions in IP-based networks. These sessions include multimedia conferencing and two-way phone calls. SIP protocol can run on User Datagram Protocol (UDP), Stream Control Transmission Protocol (SCTP) and Transmission Control Protocol (TCP) because it was created to function independently from the underlying Transport Layer as an Application Layer.
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