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.
"Interdomain SIP." YourDictionary, n.d. Web. 19 January 2019. <https://www.yourdictionary.com/interdomain-sip>.
Interdomain SIP. (n.d.). Retrieved January 19th, 2019, from https://www.yourdictionary.com/interdomain-sip
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