Dialogic 05-2239-009 User Manual

EV_ASYNC indicates the function operates in asynchronous mode 

userattr points to a buffer where user information can be stored 

Alternatively, the IPT network device and IP Media device can be opened without the voice 
resource, and the IP line device can be routed to the voice device when needed. 

Once the voice resource is attached to the IPT network and IPT Media devices, the following voice 
library functions can be used: 

dx_dial( ) to generate DTMF tones

dx_getdig( ) to detect DTMF tones

The Dialogic

®

 Global Call API library allows applications that are using the H.323 protocol to 

send certain messages that contain Nonstandard Data. This capability is supported for the 
following message types: 

User Input Indication (UII) message (H.245) 

Facility messages (Q.931) 

Registration messages 

Table 15 summarizes the set IDs and parameter IDs used to send the messages and describes the 
call states in which each message should be sent. 

The maximum length of the Global Call parameter used for the Nonstandard Data information is 
configured at start-up via the max_parm_data_size field in the IPCCLIB_START_DATA structure. 
The default size is 255 (for backwards compatibility), but applications may configure it to be as 
large as 4096 bytes. Applications must use the extended gc_util_..._ex( ) functions to insert or 
extract any GC_PARM_BLK parameter elements whose data length is defined to be greater than 
255. 

In practice, applications may not be able to utilize the full maximum length of the nonstandard data 
parameter element as configured in max_parm_data_size. The H.323 stack limits the overall size of 
messages to be max_parm_data_size + 512 bytes, and any messages that exceed this limit are 
truncated without any notification to the application.