Skycall South Africa
- Hosted VoIP billing service provider
- Partnering for Origination and Termination
- Quintum
- PortaSIP
SIP protocol was made within IETF (Internet Engineering Task Force) – organization occupied with establishing Internet standards and general standards concerning TCP/IP protocols.
InTechnology
InTechnology are UK pioneers in managed, hosted IP Telephony (VoIP) services for businesses.
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