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The message parameters in this section are defined by SCO but are based on those defined in the CAPI 2.0 specification. For more information on the CAPI Association, see their web site: http://www.capi.org/.
Some structure members are defined according to the
International Telecommunication Union (ITU, formerly
CCITT) Recommendation Q.931 (03/93) - Digital Subscriber
Signalling System No. 1 (DSS 1); the ISDN user-network
interface layer 3 specification for basic call control.
For more information, contact ITU:
International Telecommunication Union (ITU)
Place des Nations
CH-1211 Geneva 20
Switzerland
http://www.itu.ch/.
| Data type | Definitions | Comments |
|---|---|---|
| byte |
isdnU8_t
isdnBfU8_t isdnByte_t isdnOctet_t |
unsigned eight bit integers, coded as one octet.
The isdnBfU8_t type must support bit fields.
|
| word |
isdnU16_t
isdnWord_t | unsigned sixteen bit integers, coded as two contiguous octets. They are stored with the least significant octet first. |
| double word |
isdnU32_t
isdnBfU32_t isdnDword_t |
unsigned thirty two bit integers, coded as two contiguous
words.
They are stored with the least significant octet first.
The isdnBfU32_t type must support bit fields.
|
| structure | struct | variable length structure, coded as an array of octets. The first octet must contain the length of the following data. If the first octet has the value of 255 (0xFF), it indicates an escape character for interpreting the following word as the length of the data. |
Multi-octet message values are stored with the least significant octet first (little endian). This is not the same as the usual network byte order. It is specified in this manner to more closely conform to the other ISDN standards. Where bit fields are specified, it is assumed that the first bit assigned by the compiler is the least significant bit of the integer.
The CAPI 2.0 specification defines many of the data structures passed as message parameters as having variable length. This convention has been retained in the SCO ISDN implementation. Each structure must therefore begin with a length byte indicating the size of the structure. An empty structure is indicated by a length byte of 0. Parameters of the structure type must be coded as an empty structure if they are not used.
| CAPI message parameters | SCO data definition |
|---|---|
| Additional info (struct) | isdnAddInfo(D4isdn) |
| B1 Protocol (word) | isdnB1proto(D4isdn) |
| B2 Protocol (word) | isdnB2proto(D4isdn) |
| B3 Protocol (word) | isdnB3proto(D4isdn) |
| B1 Configuration (struct) | isdnB1config(D4isdn) |
| B2 Configuration (struct) | isdnB2config(D4isdn) |
| B3 Configuration (struct) | isdnB3config(D4isdn) |
|
B Channel Information (struct)
B Protocol (struct) | isdnBproto(D4isdn) |
| BC (struct) | isdnBC(D4isdn) |
| Called Party Number (struct) | isdnCalledNbr(D4isdn) |
| Called Party Subaddress (struct) | isdnCalledAdr(D4isdn) |
| Calling Party Number (struct) | isdnCallingNbr(D4isdn) |
| Calling Party Subaddress (struct) | isdnCallingAdr(D4isdn) |
| CIP value (word) | isdnCIPvalue(D4isdn) |
| CIP mask (dword) | isdnCIPmask(D4isdn) |
| Connected Number (struct) | isdnConnNbr(D4isdn) |
| Connected Subaddress (struct) | isdnConnAdr(D4isdn) |
| Controller (dword) | isdnCtrlr(D4isdn) |
|
Data (dword)
Data Length (word) Data Handle (word) | isdnData(D4isdn) |
| Facility Selector (word) | isdnFacility(D4isdn) |
| Facility Request Parameter (struct) | not used |
| Facility Confirmation Parameter (struct) | isdnFCP(D4isdn) |
| Facility Indication Parameter (struct) | isdnFIP(D4isdn) |
| Facility Response Parameter (struct) | isdnFRP(D4isdn) |
| Flags (word) | isdnFlags(D4isdn) |
| HLC (struct) | isdnHLC(D4isdn) |
| Info (word) | isdnInfo(D4isdn) |
| Info Elements (struct) | isdnInfoEl(D4isdn) |
| Info Mask (dword) | isdnInfoMsk(D4isdn) |
| Info Number (word) | isdnInfoNbr(D4isdn) |
| LLC (struct) | isdnLLC(D4isdn) |
| Manu ID (dword) | isdnManuID(D4isdn) |
| Manufacturer Specific | Not used |
| NCCI (dword) | isdnNCCI(D4isdn) |
| NCPI (struct) | isdnNCPI(D4isdn) |
| PLCI (dword) | isdnPLCI(D4isdn) |
| Reason (word) | isdnReason(D4isdn) |
| Reason_B3 (word) | isdnReason_B3(D4isdn) |
| Reject (word) | isdnReject(D4isdn) |