Dialogic Network Device 206-412-06 Manuel utilisateur

Proprietary Extension for

COMMON-ISDN-API

Version 2.0

Extension for Fax Paper Formats

and Resolutions

October 2007

Dialogic Corporation

Sixth Edition (October 2007) 206-412-06

without permission in writing from Dialogic Corporation at the address provided below.

All contents of this document are subject to change without notice and do not represent a commitment

on the part of Dialogic Corporation or its subsidiaries (“Dialogic”). Reasonable effort is made to ensure

the accuracy of the information contained in the document. However, due to ongoing product

improvements and revisions, Dialogic Corporation and its subsidiaries do not warrant the accuracy of

this information and cannot accept responsibility for errors or omissions that may be contained in this

document.

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The names of actual companies and products mentioned herein are the trademarks of their respective

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To contact Dialogic Customer Support, visit our Web site at www.dialogic.com.

Motivation: The current COMMON-ISDN-API specification defines paper formats

ISO A4, ISO B4 and ISO A3 at standard resolution (R8 x 3.85) and high

resolution (R8 x 7.7). Support for B4 and A3 is even optional.

The following document proposes a COMMON-ISDN-API extension

that enables FAX document transmission and reception with paper

formats ISO A4, ISO B4 and ISO A3 and these resolutions as specified

in T.30:

•R8 x 3.85

•R8 x 7.7

•R8 x 15.4

•R16 x 15.4

•200 x 200

•300 x 300

•400 x 400

The page format and resolution information is passed via appropriate

fields in the SFF page header.

To reduce the additions required in a CAPI application in order to make

use of the extension, the new functionality is added directly to the

existing SFF format. This means that there is a possibility of conflict

with future official extensions of the COMMON-ISDN-API. To prevent

incompatibilities, support for FAX paper formats and resolutions must be

enabled explicitly so as to turn off any future CAPI extension that would

cause incompatibility.

Specifically, it has to be enabled by the application for a designated

controller through a manufacturer request command 9 (Options request)

with bit 6 (Enable FAX paper formats and resolutions) set. It will stay

active until either the application releases the COMMON-ISDN-API or

issues another options request with bit 6 not set.

An application can determine whether the COMMON-ISDN-API

supports FAX paper formats and resolutions by examining the CAPI

profile and searching the manufacturer string for "Eicon" or by

examining the CAPI profile and trying the manufacturer command 9

described below.

Changes since the first version from 12.1.2001:

•Added support for resolutions 300 x 600, 400 x 800, 600 x 1200, 600

x 600 and 1200 x 1200 dpi.

4.2.2.7 CAPI_GET_PROFILE

Applications call CAPI_GET_PROFILE to retrieve capability information from COMMON-ISDN-API.

COMMON-ISDN-API copies information about implemented features, the total number of controllers, and

protocols supported by the requested controller to a 64-byte buffer passed by the calling application. The

application must ignore unknown bits. COMMON-ISDN-API sets reserved fields to zero.

CAPI_GET_PROFILE fills the buffer with the following structure:

Type Description

2 bytes number of installed controllers, least significant byte first

2 bytes number of supported B-channels, least significant byte first

4 bytes Global Options (bit field):

[0]: internal controller supported

[1]: external equipment supported

[2]: Handset supported (external equipment must also be set)

[3]: DTMF supported

[4]: Supplementary Services (see Part III)

[5]: channel allocation supported (leased lines)

[6]: parameter B channel operation supported

[7]: Line Interconnect supported

[8]...[31]: reserved

4 bytes B1 protocol support (bit field):

[0]: 64 kbit/s with HDLC framing, always set.

[1]: 64 kbit/s bit-transparent operation with byte framing

from the network

[2]: V.110 asynchronous operation with start/stop byte

framing

[3]: V.110 synchronous operation with HDLC framing

[4]: T.30 modem for fax group 3

[5]: 64 kbit/s inverted with HDLC framing.

[6]: 56 kbit/s bit-transparent operation with byte framing

from the network

[7]: Modem with all negotiations

[8]: Modem asynchronous operation with start/stop byte

framing

[9]: Modem synchronous operation with HDLC framing

[10]...[31]: reserved

4 bytes B2 protocol support (bit field):

[0]: ISO 7776 (X.75 SLP), always set

[1]: Transparent

[2]: SDLC

[3]: LAPD in accordance with Q.921 for D-channel X.25

(SAPI 16)

[4]: T.30 for fax group 3

[5]: Point-to-Point Protocol (PPP)

[6]: Transparent (ignoring framing errors of B1 protocol)

[7]: Modem error correction and compression (V.42 bis or

MNP5)

[8]: ISO 7776 (X.75 SLP) modified supporting V.42 bis

compression

[9]: V.120 asynchronous mode

[10]: V.120 asynchronous mode supporting V.42 bis

[11]: V.120 bit-transparent mode

[12]: LAPD in accordance with Q.921 including free SAPI

selection

[13]...[31]: reserved

4 bytes B3 protocol support (bit field):

[0]: Transparent, always set

[1]: T.90NL with compatibility to T.70NL in accordance to

T.90 Appendix II.

[2]: ISO 8208 (X.25 DTE-DTE)

[3]: X.25 DCE

[4]: T.30 for fax group 3

[5]: T.30 for fax group 3 with extensions

[6]: reserved

[7]: Modem

[8]...[31]: reserved

24 bytes reserved for COMMON-ISDN-API use

4 bytes Private options (bit field):

[0]...[5]: reserved

[6]: FAX paper formats and resolutions

[7]...[31]: reserved

16 bytes Manufacturer-specific information

CAPI_GET_PROFILE information structure

Manu ID (dword)

The purpose of the parameter Manu ID is to communicate a dword which identifies the

manufacturer in MANUFACTURER messages. Every manufacturer supplying MANU-

FACTURER messages should choose a unique value (such as an abbreviation of the company

name).

The manufacturer ID used by Dialogic is:

0x44444944

This information element appears in:

MANUFACTURER_REQ

MANUFACTURER_RESP

MANUFACTURER_CONF

MANUFACTURER_IND

Manufacturer Specific

The purpose of the parameter manufacturer specific is to exchange manufacturer-specific infor-

mation.

Manufacturer specific information for MANUFACTURER_REQ:

word manufacturer

command Manufacturer specific operation requested.

struct manufacturer

command parameters

Command-dependent parameters for manufacturer request.

Manufacturer specific information for MANUFACTURER_CONF:

word manufacturer

command Manufacturer-specific operation that was requested.

word info Result of the operation according to COMMON-ISDN-API

definition of Info.

This information element appears in:

MANUFACTURER_REQ

MANUFACTURER_RESP

MANUFACTURER_CONF

MANUFACTURER_IND

Manufacturer Command

The purpose of the parameter manufacturer command is to specify the kind of operation requested

in a MANUFACTURER_REQ.

The following manufacturer commands are defined:

1: Assign PLCI

2: Advanced Codec control

3: DSP control

4: Signaling control

5: RXT control

6: IDI control

7: Configuration control

8: Remove Codec

9: Options request

This information element appears in:

Manufacturer Specific

Manufacturer Command Parameters

The purpose of the parameter manufacturer command parameters is to specify command

dependent parameters.

Parameters for manufacturer command 9: Options Request:

dword Options mask Manufacturer specific options that have to be enabled:

[Bit 0..5]: reserved, must be set to 0

[Bit 6]: Enable FAX paper formats and resolutions

[Bit 7..31]: reserved, must be set to 0

This information element appears in:

Manufacturer Command

ANNEX B(NORMATIVE): SFF FORMAT

B.1 Introduction

SFF (Structured Fax File) is a representation specific to fax group 3 documents. As

shown below in Fiugre 6 it consists of information concerning the page structure and

compressed line data of the fax document. An SFF-formatted document always starts

with a header, which is valid for the complete document. Every page starts with a page

header. This is followed by the pixel information, line by line. As the SFF format is a

file format specification, some entries in header structures (e.g. double-chaining of

pages) may not be used or supported by COMMON-ISDN-API.

document

header page 1

data page 2

header page 2

data ... page n

data

Figure 6: SFF format

B.2 SFF coding rules

The following type conventions are used:

byte 8-bit unsigned

word 16-bit unsigned integer, least significant octet first

dword 32-bit unsigned integer, least significant word first

B.2.1 Document header

Parameter Type Comment

SFF_Id dword Magic value (identification) of SFF Format: coded as

0x66666653 ("SFFF")

Version byte Version number of SFF document: coded 0x01

reserved byte Reserved for future extensions; coded 0x00

User Information word Manufacturer-specific user information (not used by COM-

MON-ISDN-API, coded as 0x0000)

Page Count word Number of pages in the document. Must be coded 0x0000 if

not known (as in the case of receiving a document).

OffsetFirstPageHeader word Byte offset of first page header from start of document

header. This value is normally equal to the size of the docu-

ment header (0x14), but there could be additional user-

specific data between the document header and the first page

header. COMMON-ISDN-API ignores and does not provide

such additional data.

OffsetLastPageHeader dword Byte offset of last page header from start of document header.

Must be coded 0x00000000 if not known (as in the case of

receiving a document).

OffsetDocumentEnd dword Byte offset of document end from start of document header.

Must be coded 0x00000000 if not known (as in the case of

receiving a document).

B.2.2 Page header

Parameter Type Comment

PageHeaderID byte 254 (Page data record type)

PageHeaderLen byte 0: Document end

1...255: byte offset of first page data from the Resolution

Vertical field of the page header. This value is normally equal

to the size of the remainder of the header (0x10), but there

could be additional user-specific data between page header

and page data. COMMON-ISDN-API ignores and does not

provide such additional data.

Resolution Vertical byte Definition of vertical resolution; different resolutions in one

document may be ignored by COMMON-ISDN-API

0: 98 lpi (standard)

1:: 196 lpi (high resolution)

2...254: reserved

255: end of document (should not be used: PageHeaderLen

should be coded 0instead)

If FAX paper formats and resolutions are enabled

0x00: 98 lpi (3.85 lines per millimeter)

0x01: 196 lpi (7.7 lines per millimeter)

0x02..0x7f: reserved

0x80: reserved

0x81: 100 lpi

0x82: reserved

0x83: 200 lpi

0x84: reserved

0x85: 300 lpi

0x86: 392 lpi (15.4 lines per millimeter)

0x87: 400 lpi

0x88..0x8a: reserved

0x8b: 600 lpi

0x8c..0x8e: reserved

0x8f: 800 lpi

0x90..0x96: reserved

0x97: 1200 lpi

0x98..0xff: reserved

Resolution Horizontal byte Definition of horizontal resolution

0: 203 dpi (standard)

1...255: reserved

If FAX paper formats and resolutions is enabled

0x00: 203 dpi (R8, 8 pels per millimeter)

0x01..0x7f: reserved

0x80: reserved

0x81: reserved

0x82: reserved

0x83: 200 dpi

0x84: reserved

0x85: 300 dpi

0x86: 406 dpi (R16, 16 pels per millimeter)

0x87: 400 dpi

0x88..0x8a: reserved

0x8b: 600 dpi

0x8c..0x96: reserved

0x97: 1200 dpi

0x98..0xff: reserved

Coding byte Definition of pixel line coding

0: modified Huffman coding

1...255: reserved

reserved byte Coded as 0

Line Length word Number of pixels per line

1728: standard fax G3

2048: B4 (optional)

2432: A3 (optional)

Support for additional values is optional for COMMON-

ISDN-API

If FAX paper formats and resolutions are enabled

1728: ISO A4 at R8 x 3.85, R8 x 7.7, R8 x 15.4, 200 x 200

2048: ISO B4 at R8 x 3.85, R8 x 7.7, R8 x 15.4, 200 x 200

2432: ISO A3 at R8 x 3.85, R8 x 7.7, R8 x 15.4, 200 x 200

2592: ISO A4 at 300 x 300, 300 x 600

3072: ISO B4 at 300 x 300, 300 x 600

3648: ISO A3 at 300 x 300, 300 x 600

3456: ISO A4 at R16 x 15.4, 400 x 400, 400 x 800

4096: ISO B4 at R16 x 15.4, 400 x 400, 400 x 800

4864: ISO A3 at R16 x 15.4, 400 x 400, 400 x 800

5184: ISO A4 at 600 x 600, 600 x 1200

6144: ISO B4 at 600 x 600, 600 x 1200

7296: ISO A3 at 600 x 600, 600 x 1200

10368: ISO A4 at 1200 x 1200

12288: ISO B4 at 1200 x 1200

14592: ISO A3 at 1200 x 1200

Page Length word Number of pixel lines per page. If not known, coded as

0x0000.

OffsetPreviousPage dword Byte offset to previous page header or 0x00000000. Coded as

0x00000001 if first page.

OffsetNextPage dword Byte offset to next page header or 0x00000000. Coded as

0x00000001 if last page.

B.2.3 Page data

Page data are coded line by line: data describes each pixel row. Lines are coded as

records of variable length; each line is coded according to the element coding in the

page header. At present, only modified Huffman coding is supported. MH coding is

bit-oriented: the pixel bits are stored in the bits of code words least significant first. No

EOL code words or fill bits are included. If the data include EOL code words,

COMMON-ISDN-API ignores these.

Each record is identified by the first byte:

•1...216: a pixel row with 1...216 MH-coded bytes follows immediately

•0: escape code for a pixel row with more than 216 MH-coded bytes. In this case, the following

word in the range 218...32767 defines the number of MH-coded bytes which follow.

•217...253: white space, skip 1...37 empty lines

•254: start of page header (see above)

•255: if followed by a byte with value 0, illegal line coding. Applications may choose whether

to interpret this line as empty or as a copy of the previous line. If this byte is followed by a byte

with a value 1...255, then 1...255 bytes of additional user information follow (reserved for

future extensions).

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