From https://wiki.asterisk.org/wiki/display/AST/Channels

"The primary exception is with Local Channels. In the case of local channels, 
you'll typically have two local channel legs, one that is treated as outbound 
and the other as inbound. In this case both are really inside Asterisk, but one 
is executing dialplan and the other is not. The leg executing dialplan is the 
one treated as inbound."

In your case, context-00000ce9;1 is the inbound channel because you did 
Dial(Local/number@context) and context-00000ce9;2 is the outbound channel 
because it did the Dial to another destination. Simply, the numbers represent 
each leg of a local channel.

Tom


On 2022-09-07, 10:18 AM, "asterisk-users on behalf of Antony Stone" 
<asterisk-users-boun...@lists.digium.com on behalf of 
antony.st...@asterisk.open.source.it> wrote:

    On Wednesday 07 September 2022 at 11:44:54, Antony Stone wrote:

    > Hi.

    This is a follow-up to an email I posted earlier today to the list, 
although I 
    haven't seen it come back yet.  If it's under moderation for some reason, I 
    hope some kindly admin will release it :)

    > I'm trying to deal with a problem regarding putting a call on hold and 
then
    > later resuming it.  I am using chan_sip throughout, and Asterisk 16.

    <snip detail from previous email>

    > The main thing which is puzzling me about this is that I see examples of
    > both Local/number@context-00000ce9;1 and Local/number@context-00000ce9;2
    > during the processing of the calls.
    > 
    > What is the significance of the number following the semi-colon?
    > 
    > I also see in verbose logging output:
    > 
    > [2022-09-07 09:37:57.310706] pbx VERBOSE[29148]: dial.c:598 in
    > handle_frame: Local/number@context-00000ce9;1 answered
    > 
    > [2022-09-07 09:37:57.310792] pbx VERBOSE[29155][C-00001265]:
    > bridge_channel.c:2252 in bridge_channel_internal_push_full: Channel
    > SIP/Trunkname-00002b55 joined 'simple_bridge' basic-bridge <7e260e93-
    > abd4-48ea-96f1-33601165dba2>
    > 
    > [2022-09-07 09:37:57.310937] pbx VERBOSE[29149][C-00001265]:
    > bridge_channel.c:2252 in bridge_channel_internal_push_full: Channel
    > Local/number@context-00000ce9;2 joined 'simple_bridge' basic-bridge
    > <7e260e93- abd4-48ea-96f1-33601165dba2>
    > 
    > 
    > So, when the channel Local/number@context-00000ce9;1 gets answered, the
    > result is to bridge the channels Local/number@context-00000ce9;2 and
    > SIP/Trunkname-00002b55

    I see something very similar in the documentation about local channels at 
    
https://wiki.asterisk.org/wiki/display/AST/Using+Callfiles+and+Local+Channels - 
    there are examples of both devices-ecf0;1 and devices-ecf0;2 but no mention 
of 
    what the final digit means.

    Can anyone enlighten me please?


    Antony.

    -- 
    Never automate fully anything that does not have a manual override 
capability. 
    Never design anything that cannot work under degraded conditions in 
emergency.

                                                       Please reply to the list;
                                                             please *don't* CC 
me.

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