> On Wed, 2008-10-29 at 14:08 -0400, Dale Worley wrote:
> > On Tue, 2008-10-28 at 21:33 +0000, Scott Lawrence wrote:
> > > Martin take note - Dale is making all our messages significantly 
> > > smaller !
> > 
> > Thinking about things further, unfortunately even if we append the 
> > hostport to the Call-Id, we need to use a 64-bit random 
> field, because 
> > we can't depend on the hostport to be unique across the 
> Internet -- an 
> > awful lot of sipX's will have address 168.192.1.10, for instance.
> 
> Don't use the address - use the domain name.  That will be 
> much more likely to be unique.  Anyone using a domain that 
> isn't legit in the DNS or one ending in .local won't be able 
> to do SIP over the Internet anyway, so they only need to 
> worry about collisions within the domain and (I have it on 
> good authority that) the smaller number of bits is fine for that.

SipXecs systems in an HA deployment share the same domain name.  Would
that increase the odds of call-ID collisions between systems.  Could the
MAC address be used here as a way to improve uniqueness?
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