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About

A channel (a call) will go through many different states during its lifetime. Here we will describe the different states that a channel might find itself in, and what each of those states mean.


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States

From switch_types.h:

State

(Channel-State)

State Number

(Channel-State-Number)

Description
CS_NEW

0

Channel is newly created.
CS_INIT1Channel has been initialized.
CS_ROUTING2

Channel is looking for an extension to execute.

CS_SOFT_EXECUTE3Channel is ready to execute from 3rd party control.
CS_EXECUTE4Channel is executing its dialplan.
CS_EXCHANGE_MEDIA5Channel is exchanging media with another channel.
CS_PARK6Channel is accepting media awaiting commands.
CS_CONSUME_MEDIA7Channel is consuming all media and dropping it.
CS_HIBERNATE8Channel is in a sleep state.
CS_RESET9Channel is in a reset state.
CS_HANGUP10Channel is flagged for hangup and ready to end. Media will now end, and no further call routing will occur.
CS_REPORTING11The channel is already hung up, media is already down, and now it's time to do any sort of reporting processes such as CDR logging.
CS_DESTROY12Channel is ready to be destroyed and out of the state machine. Memory pools are returned to the core and utilized memory from the channel is freed.
CS_NONE13

TODO What does this do? In the source, it simply calls C's abort().

State Handlers

Custom state handlers can be added to the channels either globally or on a per-channel basis. This will allow you to do your own custom reporting or clean up your own dynamically created objects, for example. Custom handlers can also be then removed from a channel.

See Also


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