[asterisk-dev] Is ast_channel->uniqueid really unique ?

[Chris Icide]

Oded,

I believe that you can set a systemname=blah in asterisk.conf and that 
will be pre-pended with a dash to the uniqueid.

For example:

systemname=node1

the uniqueid might look like

node1-11673478409.12

This would be 100% unique as long as you gave each system a different name.

-Chris

Oded Arbel wrote:
> >From what I understand, the uniqueid field in the ast_channel is unique
> for a single installation of Asterisk, and is composed of the unix
> timestamp at the creation of the channel plus some running counter. 
>
> The problem I'm having, is that I don't think that a channel's uniqueid
> is unique across multiple Asterisk installations - under some very
> common behaviors of a multiple Asterisk installation, some channels
> created on different Asterisk instances will have the same uniqueid.
>
> I'm thinking about changing the uniqueid generation algorithm to
> something that generates ids that have a high statistical probability to
> be unique across multiple instances of Asterisk given some reasonable
> assumptions (for example - that there are less then a few thousands of
> Asterisk instances to be considered). I'm not looking for a truly
> globally unique identifier, just unique enough.
>
> Do you think that this is doable/interesting/good idea ?
>
> --
> Oded Arbel
> Atelis
> oded at atelis.net
> Tel: +972-54-7340014
> ::..
> Don't get me started on libtool (aka 'Hey, let's write a complex library
> dependency processing application, which needs to be using graph
> algorithms, in a huge shell script that actually travels backwards in
> time because it's moving so slow")
>     -- Dan Berlin on the subversion development mailing list
>
>
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