Vertical SBX IP 320 Service Manual download pdf (Page 293)

H.245 Tunneling B-5

Appendix B: VoIP Service

SBX IP Programming & Operations Guide

H.245 Tunneling

This allows entities in the signalling path (such as gatekeepers) to perform functions (such as

divert on no-reply or other advanced call control) that result in a Q.931 call state at one endpoint

that differs from the actual call state at another endpoint.

Such intermediate entities ensure that H.245 messages (encapsulated in Q.931 messages) are

forwarded to the other endpoint. Furthermore, such messages are forwarded even if the Q.931

message in which the H.245 message is encapsulated might be consumed (and not forwarded

to) the other endpoint.

This is accomplished by transferring the encapsulated H.245 message into a FACILITY

message, with the h323-message-body set as "empty". For example, if a gatekeeper has

already sent a CONNECT message to a calling endpoint, then later receives a CONNECT

message from a called endpoint that contains an encapsulated H.245 message, it will forward

the H.245 message using a FACILITY message.

ADMIN PROGRAMMING

Enable H.245 Tunneling

Normal/Fast mode for H.323

H.323 endpoints may establish media channels in a call by using either the procedures defined

in Recommendation H.245, or the "Fast Connect" procedure described as follows:

The Fast Connect procedure allows the endpoints to establish a basic point-to-point call with as

few as one round-trip message exchange. This enables immediate media stream delivery upon

call connection.

The calling endpoint initiates the Fast Connect procedure by sending a SETUP message

containing the fastStart element to the called endpoint. The fastStart element consists of a

sequence of OpenLogicalChannel structures describing media channels. The calling endpoint

sends and receives these media channels (including all of the parameters necessary) to

immediately open and begin transferring media on the channels.

H.245 Tunneling -- selects H.245 Tunneling. PGM 340 + FLEX 20 + 0

(Off) + [HOLD/SAVE]

VALUES --

0 = Off

1 = On

Release 3.5

June 2010

1 2 ... 288 289 290 291 292 293 294 295 296 297 298 ... 451 452

No comments

Vertical SBX IP 320 Service Manual Page 293