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

seenagape

9 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