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...ed. Furthermore, new operations can be defined and implemented by external modules.

The most important aspect of Yate is its message-passing system. Modules are passing around messages among them. This allows us to have a bigger fle * '''Yate Modules''' - modules of Yate are equal no matter if they are telephony or routing or anything el

... In those cases the mapping of the called number must be done from routing modules.

This is a brief introduction on how the PSTN signalling modules are working together in Yate.

... in Yate can be done from a single routing module or from a combination of modules.

The '''chan.startup''' message is sent by channel modules when a new channel is instantiated. ...nnels like Tone Generator and Wave File do not emit this message. External modules also have to emit it themselves.

The chan.hangup message is sent by channel modules when a channel is hung up - typically this is the last message ever seen ab ...nnels like Tone Generator and Wave File do not emit this message. External modules also have to emit it themselves.

The '''chan.dtmf''' is used for sending DTMFs between modules in the engine.

It is understood by at least [[wavefile]] and [[tonegen]] modules.

* [[Modules]]

For external modules/scripts, the dumb channel module provides Data Endpoints to and from nowher * [[Modules]]

... Tone Generator, Wave File and RTP modules can provide data nodes to other modules. :::desired sample rate of the attached data node(s), default 8000Hz; not all modules support sample rate setting

* [[Modules]]

... certain user from an authentication module. If none of the authentication modules ([[regfile]]) know about this user then the module who started authenticati The default is to have all modules attempt to perform authentication:

Since the message should be observed by multiple modules all handlers ''must'' return false.

...dule that a user has been registered in system. If none of the registering modules (e.g. [[regfile]]) accept the registration then the module which started re

...r will be replaced with a pointer to an YRTPWrapper object, allowing orher modules to access RTP channel's internal objects (Socket, DataSource, DataConsumer,

...e.g. accfile or client). The message is targeted towards channel-providing modules (e.g. h323chan or ysipchan).

'''engine.timer''' is a message sent by the engine to the modules that have a message handler registered for it and is intended to act as a m

'''engine.halt''' is a message sent by the engine to the modules that have a message handler registered for it. ...s it only serves as a means of shutdown notification towards the listening modules.