Dialogic 05-2548-006 Updates to the ipmSetParm and ipmGetParm functions, Parmchlatencyalgaudio

•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.

22Dialogic® Multimedia Software for ATCA Release 1.0 Release Update, Rev 06 — January 23, 2008 Dialogic Corporation