[asterisk-dev] channel name uniqueness

[Paul Albrecht]

On Mon, 2009-05-18 at 15:39 -0500, Russell Bryant wrote:
> Paul Albrecht wrote:
> > I have a question about the channel name. Specifically, is it guaranteed
> > to be unique? The reason I'm asking is because sip channels use the
> > pointer to their private block in their channel name, but that only
> > ensures uniqueness if asterisk is compiled 32 bit.
> 
> Channel names are not guaranteed to be unique throughout system
> lifetime.  There will (should!) never be more than one channel with the
> same name at the same time, though.
> 
> The unique ID field on a channel is what uniquely identifies it from
> others that had the same name.  The unique ID field is a monotonically
> increasing integer, a timestamp, and optionally, a system name.
> 

Hmmm, ... what about the "ASCII unique channel name", is it unique? For
sip channels, it's set in sip_new by calling ast_channel_alloc with
format string "SIP/%s-%08x", where the the string is a host address and
the number is a 32 bit pointer to the channel's private data pointer.

-- 
Paul Albrecht