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22 Dialogic
®
Multimedia Software for ATCA Release 1.0 Release Update, Rev 06 — January 23, 2008
Dialogic Corporation
• To retrieve T.38 fax port information, set the eMediaType field to
MEDIATYPE_LOCAL_UDPTL_T38_INFO and unCount to 1.
Note: It is not possible to retrieve T.38 fax port information together with audio and/or
video port information.
Note: The RTCP port number is the RTP port number + 1.
Update to the ipm_GetLocalMediaInfo( ) function
In the code example of the ipm_GetLocalMediaInfo( ) function, replace the line:
MediaInfo.unCount = 1;
with:
MediaInfo.unCount = 2;
Update to the ipm_ReceiveDigits( ) function
Not supported for the ATCA Multimedia Platform.
Update to the ipm_SendDigits( ) function
Not supported for the ATCA Multimedia Platform.
Updates to the ipm_SetParm( ) and ipm_GetParm( ) functions
In addition to the parameters documented in Table 2, “eIP_PARM Parameters and
Values” on the IPM_PARM_INFO data structure reference page, the IP Media Library
API supports the setting and retrieval of the following parameters relating to Packet
Loss Recovery (PLR) latency.
eIP_PARM Define Description and Values
PARMCH_LATENCYALG_AUDIO Defines the mode of operation of the jitter buffer. By default,
the jitter buffer uses “adaptive mode,” which means latency can
grow until the available number of frames (PARMCH_
LATENCYFRAMEMAX_AUDIO) is depleted. Using fixed
mode, the number of frames buffered can grow up to 1.5 times
the starting value (PARMCH_LATENCYFRAMEINIT_AUDIO).
Type: Integer. Values: 0 (adaptive mode) or 1 (fixed mode).
Default: 0.
Note: Use “adaptive mode” to minimize audio loss due to
abnormal packet reception conditions. Use “fixed mode”
to minimize latency growth by sacrificing audio quality.