This MIB provides configuration of Jitter buffer mode on a call and initial jitter delay value per Codec based. Prior to this, the configuration are specify on a Card based. The Card level objects vismJitterDelayMode and vismJitterInitialDelay in CISCO-VISM-MODULE-MIB are now deprecated.
This object is used to provision the jitter buffer mode to be apply to a call connection. The possible values are: 'fixed' : means use a constant jitter buffer size, which is defined by the vismJitterInitialDelay (specify in CISCO-VISM-MODULE-MIB MIB) variable. The DSP will be instructed to use fixed with no time-stamps mode. 'adaptive': means let the DSP pick the optimal value for the call connection.
'fixedWithTimeStamp': means use a constant jitter buffer size, which is defined by the vismJitterInitialDelay variable. The DSP will be instructed to use fixed with time-stamps mode.
For 'g711u', 'g711a', 'clearChannel', and 'lossless' the default value is fixed.
For 'g726r32000', 'g729a', 'g729ab', 'g726r16000', 'g726r24000','g726r40000', 'g723h','g723l', 'g723ah' and 'g723al' the default value is adaptive.
This object defines the jitter buffer size in milliseconds. If the vismCodecJitterDelayMode is set to be 'fixed', the jitter buffer is fixed at this value for the duration of the call, if it is set to 'adaptive', the value of this object is the initial jitter buffer size, and the DSP will adapt to an optimal size dynamically.
For G.711u, G.711a, Clear Channel, the default value is 100 ms.
For lossless the default value is 16ms.
For 'g726r32000', 'g729a', 'g729ab', 'g726r16000', 'g726r24000','g726r40000', 'g723h','g723l', 'g723ah' and 'g723al' the default value is 60 ms.
The jitter buffer size of this object differs for each set of codecs supported on VISM card. A set of codecs supported is identified by vismCodecTemplateNum object(defined in CISCO-VISM-CODEC-MIB MIB).
For codecs in template number 1, 3, 4, and 5: the jitter buffer size is as follow: 'zero', 'five', 'ten' 'fifteen', 'twenty', 'thirty', 'fourty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninty', 'hundred'.
For codecs in template 2, the jitter buffer size is as follow: 'zero', 'five', 'ten', 'fifteen', 'twenty', 'twentyfive', 'thirty', 'thirtyfive', 'fourty', 'fortyfive', 'fifty', 'fiftyfive', 'sixty', 'sixtyfive', 'seventy', 'seventyfive', 'eighty', 'eightyfive', 'ninty', 'ninetyfive', 'hundred'.
When the codec template changes, the value of this object will be implicitly set to the default value.