ZyXEL Communications IES-1248-51 Guía de usuario descargar pdf (Pagina 321)

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Chapter 45 VoIP

IES-1248-51V User’s Guide

321

45.1.5 RTP

When you make a VoIP call using H.248, the RTP (Real time Transport Protocol) is

used to handle voice data transfer. See RFC 1889 for details on RTP.

45.1.6 Voice Coding

A codec (coder/decoder) codes analog voice signals into digital signals and

decodes the digital signals back into voice signals. The IES-1248-51V supports the

following codecs.

MGC --> MG1 MGC modifies RTP Termination, providing

information on how to send RTP stream to MG2.

Modify

MGC --> MG1 MGC modifies Analog Termination on MG1 to

send ringing tone to phone A.

Modify

MG1 --> Phone A MG1 send ringing tone to phone A. N/A

MG2 --> Phone B MG2 rings phone B. N/A

Phone B --> MG2 User of phone B picks up. MG2 detects off-hook. N/A

MG2 --> MGC MG2 reports to MGC that phone B is off-hook. Notify

MGC --> MG1 MGC modifies analog Termination on MG1 to

stop playing ringing tone to phone A.

Modify

MGC --> MG2 MGC modifies analog Termination on MG2 to

stop ringing phone B.

Modify

MGC --> MG1 MGC modifies RTP Termination on MG1 to

transfer media with RTP Termination on MG2.

Modify

MGC --> MG2 MGC modifies RTP Termination on MG2 to

transfer media with RTP Termination on MG1.

Modify

Phone A --> MG1 User of phone A finishes call and replaces

receiver on hook.

N/A

MG1 --> MGC MG1 reports on-hook to MGC. Notify

MGC --> MG1 MGC removes MG1’s RTP Termination from its

Context. The RTP Termination is ephemeral and

is destroyed.

Subtract

MGC --> MG1 MGC removes phone A’s analog Termination

from its Context. The Context is destroyed. The

analog Termination is physical and returns to

the Null Context.

Subtract

MGC --> MG2 MGC removes MG2’s RTP Termination from its

Context. The RTP Termination is ephemeral and

is destroyed.

Subtract

MGC --> MG2 MGC removes phone B’s analog Termination

from its Context. The Context is destroyed. The

analog Termination is physical and returns to

the Null Context.

Subtract

Table 111 H.248/MEGACO Call Procedure Example

DIRECTION ACTION COMMAND

1 2 ... 316 317 318 319 320 321 322 323 324 325 326 ... 653 654

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