Using Jitterbuffer in Asterisk 13

Enabling Jitterbuffer in Asterisk 13 adds a jitterbuffer to the Read side of the channel. This dejitters the audio stream before it reaches the Asterisk core. This is a write only function in iax.conf. 

Jitterbuffers are contsructed in two different ways. The first always takes three arguments: max_size, resync_threshold, and target_extra. Alternatively, a single argument of default can be provided, which will construct the default jitterbuffer for the given jitterbuffer type.

The arguments are:

• max_size: Length in milliseconds of the buffer. Defaults to 200ms.

• resync_threshold: The length in milliseconds over which a timestamp difference will result in resyncing the jitterbuffer. Defaults to 1000ms.

• target_extra: This option only affects the adaptive jitterbuffer. It represents the amount of time in milliseconds by which the new jitterbuffer will pad its size. Defaults to 40ms.