What is required for Cisco TelePresence Server to communicate with Cisco WebEx, using the PSTN?

seenagape

10 years ago

What is required for Cisco TelePresence Server to communicate with Cisco WebEx, using
the PSTN?

A.
Cisco 3420 ISDN Gateway

B.
third-party interop key

C.
Web Conferencing feature key

D.
Cisco TelePresence MCU 5300