How many bits are there in a Class B address in Net ID (Network portion) and Host ID (Host Portion) fields by default?

Which layer of the TCP/IP model ensures the quality and deliverability of VoIP packets?

Types of address signaling?

Which signaling protocol can be used with gateways over a VoIP network?

Which one is responsible for electrical echo on telephone networks?

Which one provide transport security by using encryption, data integrity and data authentication?

Three elements of a security policy necessary for a VoIP network?

You have to use an H.323 proxy if the firewall does not support dynamic access control.

How many bits are there in a MAC address?

Which VoIP protocol is an emerging standard for PSTN gateway control?

On which IP enabled device can VoIP telephone services work?