What is the function of D (Data) channel in ISDN?

Which TCP port number is used by H.323 protocol for call setup?

Full form of DSL?

What is a soft phone?

Full form of DPNSS?

Is it possible to transport fax and modem traffic over a VoIP network?

Which protocol does VoIP use at the transport layer of the TCP/IP model?

On which layer of the OSI model does TCP & UDP work?

Two steps involved in the process of conversion of digital signals into analog signals?

Which cable is mostly used in traditional telephones?

Protocol to reduce the size of RTP/UDP/IP headers from 40 bytes to 2 bytes (mostly) to save bandwidth and provide better throughput?