[cisco-voip] DIDs / ELINs for use in CER ?

[Ted Nugent]

If the provider is sending the BTN to the PSAP they
need to fix that, that’s NOT how it’s supposed to
work. However you are right 90% of the installs that
I've have done have run into this problem but its
usually resolved with a call to the provider telling
them to honor the calling number sent to them.

And actually it would be a problem with passing
location info especially if you were working in a
multi-building or multisite environment because your
ERLs and ELINS are tied together in the PSAP ALI DB.
If the BTN is being sent as opposed to the actual ELIN
 then emergency personnel would always be sent to the
bill to address even if the ERL is in another building
2 blocks over on the second floor. So you absolutely
need to get that fixed for CER to work correctly.


--- Dark Fiber <d4rkf1ber at gmail.com> wrote:

> I am getting a bit confused about something
> regarding the use of DIDs in CER.
> 
> The documents basically state that you need to get
> some DID's from the
> service provider for each ERL you plan to define,
> these DID's will be
> used as ELINs to both identify the location and for
> the PSAP to return
> the call if need be.
> 
> So a 911 call is placed, and once things are setup
> CER will basically
> do or have CM do a translation of the users
> extension to one of these
> DIDs you specify so that the service provider  will
> know what PSAP
> that call needs to get routed to and so the PSAP
> will have a number to
> call back on and such.
> 
> All sounds fine and dandy I guess.
> 
> However, my experience (which isn't much) has led me
> to think that
> usually when dealing with  DID ranges from a service
> provider that on
> 911 calls the service provider does not usually pass
> the DID of the
> phone to the PSAP but rather the billing number
> which is usually the
> first number of the range I thought?
> 
> This isn't a problem as far as passing the location,
> but it would be a
> problem for a return call from the PSAP.  CER would
> be looking for a
> call coming into one number which would be mapped to
> the phone which
> called 911, however if the billing number was passed
> to the PSAP thats
> the number that would be called back.
> 
> Hopefully I am just blanking on something here and
> this is not the case.
> 
> Can anyone enlighten me on what I am missing here? 
> Thanks!
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