PPL Component for H.225 - 0x00A1

Overview

This section includes configuration bytes, PPL Events, and Event Indications for the PPL Component H.225. This section also includes information on how this component affects the Call Progress and Alerting messages

Table 8-7 Configuration Bytes

Byte (Hex)

Function

Option (*default)

0x01

Propagate PPL Event Indications to Host

0x00* - Do not propagate

0x01 - Propagate

0x02

Cut voice path after sending/receiving Alerting message.

0x00 - Disable

0x01 - Enable

0x03

Cut voice path after sending/receiving Progress message.

0x00 - Disable

0x01 - Enable

PPL Event Request

Table 8-8 PPL Event Request

PPL Event Request ID

Purpose

0x09

H.225 Alerting

0x0A

H.225 Progress Request

 

Table 8-9 PPL Event Indications

PPL Event Indication ID

Purpose

0x01

Fax Start

0x02

Fax End

0x05

Modem Start (not supported)

0x06

Modem End (not supported)

0x07

RTP Timer Expired

0x08

Media Inactivity Timer Expired

0x09

H.225 Alerting Indication

0x0A

H.225 Progress Indication

Important! The PPL Indications will always have one ICB which give the IP Signaling Series 3 card ID ICB information.

Call Progress and Alerting Messages

Configuring the PPL Component 0xA1 to Transmit the PPL Event Indications

To enable the Excel platform to transmit the PPL Event Indication message to the host, you must set Configuration Byte 1 for PPL Component L3P H.225 (0xA1) to 0x01. To disable, set the configuration byte to 0x00.

Table 8-10 Sample PPL Configure message

Header

00 01 00 D7 00 00 01

AIB (Range of Channels)

01 02 0D 03 00 A8 00 0D 03 00 AC 1F

Component ID

00 A1

Entity

01

Number of Config. Bytes

01

Config. Byte Number

01

Data

00 - disable

01 - enable

The PPL Event Indications will include an ICB of Progress Indicator IE (Information Element) if this IE is included in the Alerting or Progress message received from the network.

Table 8-11 Example

Header

00 16 00 43 00 00 01

AIB

00 01 0D 03 00 A8 00

Component ID

00 A1

PPL Event

00 09 or 00 0A

Count

0x01 or 0x02

Type

Data 0x02

Subtype

IP Signaling Card ID 0x5B

Example: 0x003C

Following data is optional

 

Type

Data 0x02

Subtype

ISDN formatted IE 0x10

Length

0x06

Data

01 08 03 00 00 01

H.225 Progress Request (0x0A) signals to the IP Signaling Series 3 card when to transmit the Progress message to the network.

Table 8-12 Sample PPL Event Request

Header

00 11 00 44 00 00 01

AIB (Channel)

00 01 0D 03 00 A8 00

Component ID

00 A1

PPL Event Request

00 0A

Number of ICBs

00 or 01

If the application requires the voice path brought in, select 01 (see ICB below)

 

Data ICB Progress Indicator IE

The PLL Event Request message may also include a data ICB - Progress Indicator Information Element (IE). This IE requests the IP Signaling Series 3 card to transmit a Progress message to the network and include the Progress IE.

This IE may be ISDN Raw (0x11) or Formatted (0x10). See the following examples:

Table 8-13 ISDN Raw Data

Header

00 19 00 44 00 00 FF

AIB (Channel)

00 01 0D 03 00 00 00

Component ID

00 A1

PPL Event Request

00 0A

Number of ICBs

01

ICB Type

02

IE (ISDN Raw)

11

Length

05

Number of IEs

01

IE Type

1E

IE Length

02

IE Data

80 88 or 80 81

Table 8-14 Formatted Data

Header

00 19 00 44 00 00 FF

AIB (Channel)

00 01 0D 03 00 00 00

Component ID

00 A1

PPL Event Request

00 0A

Number of ICBs

01

ICB Type

02

IE (ISDN Raw)

10

Length

06

Number of IEs

01

IE Type

08

IE Length

03

IE Data

00 00 08 or 00 00 01

 

Configuring the PPL Component 0xA1 to Establish the Voice Path

To enable the Excel platform to establish the voice path before sending or receiving the Connect message, you must set either Configuration Byte 2 or 3 for the PPL Component H.255 (0x00A1) as described below.

Parking the channel allows the Alerting or Progress message to be sent to the host. Parking is optional when you set Configuration Byte 2 but mandatory when you set Configuration Byte 3.

Alerting Message

If you enable Configuration Byte 2 as indicated below, the voice path cut-through happens after the Alerting message is sent or received, whether or not the Progress Indicator IE is present.

Table 8-15 PPL Configure Message with Configuration Byte 2

Header

01 17 00 D7 00 00 01

AIB (Range of Channels)

01 02 0D 03 00 A8 00 0D 03 00 AC 1F

Component ID

00 A1

Entity

01

Number of Config. Bytes

01

Config. Byte Number

02

Data

00 - Disable

01 - Enable

Progress Message

If you enable the configuration byte below, the voice path cut-through happens after the Progress message is sent. This happens if the Progress message is sent or received when the Progress message contains the Progress Indicator IE and the Progress Description is set to 1 or 8.

Table 8-16 PPL Configure Message with Configuration Byte 3

Header

00 17 00 D7 00 00 01

AIB (Range of Channels)

01 02 0D 03 00 A8 00 0D 03 00 AC 1F

Component ID

00 A1

Entity

01

Number of Config. Bytes

01

Config. Byte Number

03

Data

00 - Disable

01 - Enable

 

Both Configuration Bytes Set

If you set both configuration bytes above, the voice path cut-through happens after the Excel platform sends or receives either the Alerting or Progress messages, whichever is processed first.