{"version":"1.0","type":"link","title":"Telephone User Part - Newikis","description":"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 It has now largely been replaced by ISUP.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…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400}