What are three tasks that a voice gateway performs?

Voice gateways perform some or all of the following tasks:

• Interfacing with the IP network and the PSTN or PBX
• Supporting IP call control protocols, in addition to TDM call control protocols
• Performing call setup and teardown for calls between the VoIP and PSTN networks by terminating and reoriginating the call media and signaling
• Providing supplementary services, such as call hold and transfer
• Relaying DTMF tones
• Supporting analog fax and modems over the IP network

What are two benefits of adding an IPIPGW between networks?

Placing an IPIPGW between networks gives added network privacy and additional security.

What are four tasks that an H.323 gatekeeper performs?

An H.323 gatekeeper can perform the following functions:

• Address resolution
• Call admission control
• Bandwidth control
• Zone management
• Security
• Call management
• Routing of call control signaling

Which call control protocol is an IETF standard that requires a call agent to function?

MGCP is a call control protocol that is an IETF standard and required a call agent to function.

Which call control protocol is an IETF standard, uses a distributed call-control model, and is able to control multiple types of media connections?

SIP is an IETF standard that uses a distributed call-control model and can control multiple types of media connections.

Which call control protocol is an ITU-T standard and uses a distributed call-control model?

H.323 is an ITU-T standard that uses a distributed call-control model.

What are three typical CallManager deployment scenarios?

Three typical CallManager deployment scenarios are as follows:

• Single site deployment
• Multisite deployment with centralized call control
• Multisite deployment with distributed call control