[Freeswitch-users] What's differents with "session" and"channel"?

[will]

Thanks for the explaining, very clearly!

 

  _____  

From: Anthony Minessale [mailto:anthmct at yahoo.com] 
Sent: Thursday, August 31, 2006 7:18 PM
To: freeswitch-users at lists.freeswitch.org
Subject: Re: [Freeswitch-users] What's differents with "session"
and"channel"?

 

Essentially the session is the high level entity that represents an outside
connection and the channel is an 

object inside the session that is a collection of the higher level
components of the call.

 

see http://www.freeswitch.org/docs/structswitch__core__session.html

 

At this point channel is just a struct inside session that shows you things
you are allowed to safely play with.

 

Think of it like C++ as if channel is a class based on session as a base
class.

 

The switch_channel.c api has no idea what a session is and the core_session
api has no idea what a channel is they

only know they have an opaque pointer to each other to use api calls on when
the time comes.

 

The session contains all the low level things like access to memory pools
and the I/O routines where the channel

has things like channel variables and is the main entitiy that travels in
the state machine and passes messages and dtmf around.

 

So the short answer is that it's purely asthetic for the sake of a clean
API.

 

 


 

Anthony Minessale II

FreeSWITCH http://www.freeswitch.org/
ClueCon http://www.cluecon.com/

AIM: anthm
MSN:anthony_minessale at hotmail.com
JABBER:anthony.minessale at gmail.com

FreeSWITCH Developer Conference
sip:888 at 66.250.68.194
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pstn:712-432-7800 

 

----- Original Message ----
From: will <will at camangi.com>
To: freeswitch-users at lists.freeswitch.org
Sent: Wednesday, August 30, 2006 3:35:07 AM
Subject: [Freeswitch-users] What's differents with "session" and "channel"?

I am confused "session" with "channel" in FreeSwitch.

A channel is a connection which brings in a call to the FreeSwitch. 

Once a call is established, it is named "session". 

So multi session could exist in one channel, am I right? 

 

Will

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