An organization that provides voice over IP (VoIP) service and enables calling from SIP phones to plain-old-telephone (POTS) lines and vice versa. SIP is the universal protocol used for Internet ...
An extension to the SIP telephony protocol that carries the PSTN's ISUP call control messages between softswitches using the IP protocol. Also known as "SIP binary." See SIP and SS7. THIS DEFINITION ...
SIP SIP-trunking services are still are rapidly growing in availability though interoperability challenges spurred by different vendor and service provider implementations of SIP remain the key ...
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