VoIP

Table 1. RTP parameters (RTP MO)
Name	Value Range	Description
ComfortNoiseGeneration		Parameter is not used
JB_adaptionPeriod	1000..65535 ms	Controls the speed at which the jitter buffer can adapt downwards when current network conditions allow. Default is 10 s, which can be set lower for good networks.
JB_delayInit	0..200 ms	Initial delay of jitter buffer. Default is 0 ms.
JB_delayMax	0..200 ms	Controls maximum size of jitter buffer. Default is 200 ms. If “Hardmode” is selected this is the maximum size jitter buffer can grow. If “Softmode” then deletion occurs at “JB_deletionThreshold”.
JB_delayMin	0..200 ms	Controls minimum size of jitter buffer. Default is 0 ms.
JB_deletionMode	0..1 (boolean)	0=Softmode (audio quality focus, default) 1=Hardmode (delay focus)
JB.deletionThreshold	delayMax..500 ms	Packets exceeding deletionThreshold are deleted. Default is 500 ms.
PacketLossThreshold		Parameter is not used
VADTune	0..4	Controls VAD threshold to improve bandwidth (low value) or improve voice quality (high value). Too low value might give undesirable impact on voice quality. It is recommended to set at least 1 (default)
VLANTagValue	0..4095	VLAN ID for RTP packets (0 disables VLAN tagging)
SID_RefreshRate	0 … 60 seconds	Configures the time interval at which CN packets must be sent, even if there is no significant change in the background noise characteristic. The value 0 means that the functionality is turned off. Default value is 0 second.

Note: Setting delayMin = delayMax = delayInit makes jitter buffer non-adaptive

Table 2. VoIP channel DTMF detection parameters (TDM MO)
Name	Value Range	Description
DTMF_CompleteRemoval	0..1 (boolean)	0 = Detected DTMF tones (valid DTMF digits) are removed, but can be audible 1 = Detected DTMF tones are removed totally (adds channel delay)
DTMF_MinToneOnTime	0..8191 ms	Min tone length to qualify as DTMF digit
DTMF_MinToneOffTime	0..8191 ms	Separation between digits
DTMF_MaxDropoutTime	0..8191 ms	Max tone dropout to qualify as one digit

Note: There are further DTMF parameters that can be set with AUXKR MO (see Table 1).

Note: To meet the most industry standards, default settings minToneOn=30ms, minToneOff=35 and minDropoutTime should be used.

Table 3. VoIP channel Echo Canceller parameters (TDM MO)
Name	Value Range	Description	EC Type
EC_ECType	0..1	Selects Echo Canceller type: 0 = Standard Echo Canceller (STD) 1 = Dual-Filter Echo Canceller (DFE)	STD/DFE
EC_DFECFilterSize	8..128 ms (in steps of 8 ms)	Filter length for DFEC	DFE
EC_DFECMinErl		DFEC Minimum ERL setting (do not change)	DFE
EC_DFECAttenuation		DFEC Rx output digital gain (do not change)	DFE
EC_ECCrossCorrelationCalculation		Not used	-
EC_EchoPathChange	0..1 (boolean)	0 = Disable EPCD 1 = Enable EPCD	STD
EC_ErlChangeDetection		Not used	-
EC_FastConvergenceControl	0..1 (boolean)	Accelerates filter convergence for long filters	STD
EC_ECWindowSize	24 ms	EC window size for Standard EC	STD
EC_NLPControl	0..1 (boolean)	0 = Disble NLP 1 = Enable NLP	STD/DFE
EC_NLPTune	0..2	Not used.	STD
EC_ECTailLength	8..128ms (in steps of 8 ms)	Filter length for STD EC	STD
EC_EchoCancellerEnable		No used	-
EC_CNGEnable	0..1 (boolean)		STD/DFE
SilenceToPCMInterface	0..1 (boolean)	Not used (parameter is controlled indirectly by CNG settings)	-

Note: The column “EC type” tells for which EC type the parameter is valid.

Note: Changing EC parameters from default values might lower VoIP channel and other DSP resource densities