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Appendix C Application Programmer’s Interface 93
Call Setup
To make a call, send a SETUP message down to Q.93B and wait for a SETUP_ACK
from Q.93B. The SETUP message should include a Broadband Higher Layer
Information (BHLI) information element that contains a four-octet SAP identified as
User Specific Information. The SAP is used to identify the application on the
receiving host to which the Q.93B should direct the message. After receiving a
SETUP_ACK with a 0 error field, wait for a CALL_PROCEEDING, ALERTING,
TABLE C-3 qcc Functions
Name Functionality Input Output
qcc_bld_* Creates and encodes a message;
enables customization of a limited
set of values, depending on the
message type. Configurable values
are passed in as parameters.
Parameter values Encoded Q.2931
message (in the format
shown in
FIGURE C-2)
qcc_parse_* Extracts a defined set of values
from an encoded message
Encoded Q.2931 message
(in the format shown in
FIGURE C-2)
Parameter values
qcc_len_* Returns the maximum length of the
buffer that should be allocated for
the second strbuf in a Q.2931
message. Only applicable to user
space applications; the kernel API
allocates the buffers inside the
qcc_bld/qcc_pack functions.
none Maximum length of
the message
qcc_create_* Creates a message structure with
the required values set. You can
further customize the structure
using qcc_set_ie.
Default parameter values Message structure
(defined in
<atm/qcctypes.h>)
qcc_set_ie Updates or inserts values for an
information element into a message
structure.
Message structure and IE
structure (defined in
<atm/qcctypes.h>)
Updated message
structure
qcc_pack_* Takes a message structure and
encodes it into an actual Q.2931
message, consisting of the two
mblks (or strbufs) illustrated in
FIGURE C-2.
Message structure (defined
in <atm/qcctypes.h>)
Encoded Q.2931
message (in the format
shown in
FIGURE C-2)
qcc_unpack_* The reverse of qcc_pack_*: takes
an encoded message and decodes
the data into a message structure.
Encoded Q.2931 message
(in the format shown in
FIGURE C-2)
Message structure
(defined in
<atm/qcctypes.h>)