Annex D14 VoIP Signaling

Question 0

H.323

Answer 0

Suite protocols that provide IP networks with traditional telephony functionality

Question 1

Signaling Protocols

Answer 1

Setup, maintain and terminate a bi directional real time media stream between VoIP subscriber terminals

Provide the necessary signaling for VoIP networks to interface with the PTSN

Question 2

Media Gateway Control Protocol (MGCP)

Answer 2

Client server call control protocol used by call control devices such as CUCM to manage and control IP gateways

Question 3

Session Initiation Protocol (SIP)

Answer 3

Peer to Peer protocol in which user agents initiate sessions similar to the method utilized by H.323

Defines end to end call signaling between devices by using a text based HTTP like model of communicaiton

Question 4

Skinny Client Control Protocol (SCCP)

Answer 4

SCCP is a Cisco proprietary protocol designed to be utilized between the call manager device and the endpoint

Question 5

Real Time Transport Protocol (RTP)

Answer 5

Based off UDP which was created to provide end to end transmission of streaming media

Used to communicate directly between the voice endpoints

Question 6

Basic Phone to Phone Call Process within the CUCM administered network

Answer 6

1. Caller dials the distant end and digits are received by CUCM
2. CUCM performs lookup of distant end IP address
3. CUCM checks the status of the distant end telephone to verify that it is registered and is able to receive calls
4. IF available, CUCM rings the telephone
5. Alerted by ringing, distant user takes their phone off the hook
6. CUCM then connects the telephone sets using RTP, CUCM drops out of the call