Answer the call for a channel.This sets up duplex audio between the calling A leg and the FreeSwitch server. It is not about other endpoints. The server might need to 'answer' a call to play an audio file or to receive DTMF from the call. Once answered, calls can still be bridged to other extensions. Because a bridge after an answer is actually a transfer, the ringback tones sent to the caller will be defined by transfer_ringback.

att_xfer <channel_url> Bridge a third party specified by channel_url onto the call, speak privately, then bridge original caller to target channel_url of att_xfer.

Cancel an application currently running on the channel.Dialplan execution proceeds to the next application. Optionally clears all unprocessed events (queued applications) on the channel.

To dial multiple contacts all at once: <action application="bridge" data="sofia/internal/1010@sip.yourprovider.com,sofia/sip/1011@sip.yourprovider.com"/> To dial multiple contacts one at a time: <action application="bridge" data="sofia/internal/1010@sip.yourprovider.com|sofia/sip/1011@sip.yourprovider.com"/>

filter delete Specify the events which you want to revoke the filter. filter delete can be used when some filters are applied wrongly or when there is no use of the filter. Usage: filter delete <EventHeader> <ValueToFilter>

filterUUId delete Specify channel UUId to revoke the filter. filter delete can be used when some filters are applied wrongly or when there is no use of the filter. Usage: filter delete <Unique-ID> <uuid>

Close the socket connection.

filter Specify event types to listen for. Note, this is not a filter out but rather a "filter in, " that is, when a filter is applied only the filtered values are received. Multiple filters on a socket connection are allowed. Usage: filter <EventHeader> <ValueToFilter>

filterUUId Specify events of specific channel UUId to listen for. Note, this is not a filter out but rather a "filter in," that is, when a filter is applied only the filtered values are received. Multiple filters on a socket connection are allowed. Usage: filter <Unique-ID> <uuid>

handler() function will create pipeline for source and flow

Hangs up a channel, with an optional cause code supplied. Usage: <action application="hangup" data="USER_BUSY"/>

This function will complete a given promise with Inbound/Outbound FS connection when it receive first command reply from freeswitch else it will timeout after given timeout

Allows one channel to bridge itself to the a or b leg of another call. The remaining leg of the original call gets hungup Usage: intercept [-bleg] <uuid>

Enable log output. Levels same as the console.conf values

Places a channel "on hold" in the switch, instead of in the phone. Allows for a number of different options, including: Set caller in a place where the channel won't be hungup on, while waiting for someone to talk to. Generic "hold" mechanism, where you transfer a caller to it. Please note that to retrieve a call that has been "parked", you'll have to bridge to them or transfer the call to a valid location. Also, remember that parking a call does NOT supply music on hold or any other media. Park is quite literally a way to put a call in limbo until you you bridge/uuid_bridge or transfer/uuid_transfer it. Note that the park application takes no arguments, so the data attribute can be omitted in the definition.

This will publish the play command to FS

pre_answer establishes media (early media) but does not answer.

This function will push a command to source queue and doesn't have any mapping with this command. It is used to sending connect or auth command

Read DTMF (touch-tone) digits. Usage read <min> <max> <sound file> <variable name> <timeout> <terminators>

Record to a file from the channel's input media stream Record is used to record voice messages, such as in a voicemail system. This application will record to a file specified by <path>. After recording stops the record app sets the following read-only variables:

record_ms — duration of most recently recorded file in milliseconds record_samples — number of recorded samples playback_terminator_used — TouchTone digit used to terminate recording

Records an entire phone call or session. Multiple media bugs can be placed on the same channel.

This will publish the string version of FS command to FS

This will publish the FS command(play,transfer,break etc) to FS

Send DTMF digits from the session using the method(s) configured on the endpoint in use If no duration is specified the default DTMF length of 2000ms will be used.

Set a channel variable for the channel calling the application. Usage set <channel_variable>=<value>

Pause the channel for a given number of milliseconds, consuming the audio for that period of time. Calling sleep also will consume any outstanding RTP on the operating system's input queue, which can be very useful in situations where audio becomes backlogged. To consume DTMFs, use the sleep_eat_digits variable. Usage: <action application="sleep" data=<milliseconds>/>

Stop record session. Usage: <action application="stop_record_session" data="path"/>

Enable or disable events by class or all (plain or xml or json output format). Currently we are supporting plain events

Subscribe for myevents with uuid The 'myevents' subscription allows your inbound socket connection to behave like an outbound socket connect. It will "lock on" to the events for a particular uuid and will ignore all other events, closing the socket when the channel goes away or closing the channel when the socket disconnects and all applications have finished executing. For outbound, no need to send UUID. FS already knows the uuid of call so it automatically uses that

Immediately transfer the calling channel to a new context. If there happens to be an xml extension named <destination_number> then control is "warped" directly to that extension. Otherwise it goes through the entire context checking for a match.