Telephone User Part

Telephone User Part (TUP) provides conventional PSTN telephony services across the Signalling System No. 7 (SS7) network. TUP was the first layer 4 protocol defined by the standards bodies and as such did not provision for ISDN services. It has now largely been replaced by ISUP. However, it can still be found in operational use in some parts of the world (e.g., China).

单词	Telephone User Part
释义	Telephone User Part 英语例句库 The simple comparison is made between Integrated Server Digital Network User Part (ISUP) and Telephone User Part (TUP) in this paper. 对公共信道信令系统中的综合业务数字网用户部分(ISUP)和电话用户部分(TUP)进行了简单的比较。英语百科 Telephone User Part Telephone User Part (TUP) provides conventional PSTN telephony services across the Signalling System No. 7 (SS7) network. TUP was the first layer 4 protocol defined by the standards bodies and as such did not provision for ISDN services. It has now largely been replaced by ISUP. However, it can still be found in operational use in some parts of the world (e.g., China).
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