ZyXEL Communications IES-1248-51 Guia do Utilizador descarregar pdf (Página 320)

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Chapter 45 VoIP

IES-1248-51V User’s Guide

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Figure 149 H.248/MEGACO Call Procedure Example

The user of phone A wants to call the user of phone B. The following table shows

the series of actions necessary to set up the network and make the call

(TransactionRequests and TransactionReplies are not shown).

Note: This table illustrates the actions taken in setting up, conducting, and tearing

down a call. However, some of the actions may take place simultaneously (for

instance, when the MGC instructs MG1 and MG2 to switch to Listening mode).

Also, the commands necessary to perform some series of actions may be sent

in the same Transaction.

Table 111 H.248/MEGACO Call Procedure Example

DIRECTION ACTION COMMAND

MG1 --> MGC MG1 registers with MGC and reports its

capabilities to the MGC.

ServiceChange

MG2 --> MGC MG2 registers with MGC and reports its

capabilities to the MGC.

ServiceChange

MGC --> MG1 MGC sets MG1 to listening mode. Modify

MGC --> MG2 MGC sets MG2 to listening mode. Modify

Phone A --> MG1 User of phone A lifts the receiver off-hook. MG1

detects off-hook.

N/A

MG1 --> MGC MG1 reports phone A off-hook to MGC. Notify

MGC --> MG1 MGC instructs MG1 to play the relevant dial tone

to Phone A.

Modify

Phone A --> MG1 User of phone A dials phone B’s number. N/A

MG1 --> MGC MG1 informs MGC of the dialed number. MGC

examines dialed number, which correlates with

phone connected to MG2.

Notify

MGC --> MG1 MGC creates RTP Termination in MG1 (in the

same Context as Phone A’s existing analog

Termination).

Add

MGC --> MG2 MGC creates RTP Termination in MG2 (in the

same Context as Phone B’s analog Termination).

Add

ANALOG

IP Network

PHONE A

PHONE B

MG1

MG2

MGC

1 2 ... 315 316 317 318 319 320 321 322 323 324 325 ... 653 654

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