[VoiceOps] IAM callername instead of CNAM

[Paul Timmins]

I'm guessing that the TCAP lookup failure for an invalid CPN would cause 
it to still contain the generic name as an automatic feature to 
interoperate with canadian CNAM and as a "better than nothing" option, 
and was probably put in by the vendor as an unchangeable default.

-Paul

milosz wrote:
> after some testing i've verified (within reason) that tw only falls 
> back to genericname if the cpn is invalid.  sounds like some engineer 
> somewhere thought "wow, it would be cool if we did this!"
>
> valid cpn & genericname = "milosz" -> tw caller id = cpn cnam entry
> invalid cpn & genericname = "milosz" -> tw caller id = "milosz"
> invalid cpn & genericname = null -> tw caller id = "0"
>
> On Thu, Feb 4, 2010 at 9:59 AM, David Birnbaum <davidb at pins.net 
> <mailto:davidb at pins.net>> wrote:
>
>     It sure sounds like it.  TWTC is "cheating", I suppose, and
>     depriving the rightful owner of that number of their CNAM revenue
>     (should you take the carrier view of things).
>
>     Regardless of what the "best" answer is, in the US all carriers
>     are supposed to deliver CNAM by dipping the central database,
>     paying the owning carrier, and delivering the result to their
>     subscriber.  But that's really a discussion for another thread.
>
>     Cheers,
>
>     David.
>
>     -----
>
>
>     On Wed, 3 Feb 2010, milosz wrote:
>
>         not sure whether what you are saying can apply here, since
>         this is a case of a call from a
>         non-tw pri to their residential tw voip phone.  doesn't that
>         necessarily mean that tw is not
>         doing a CNAM dip on the call?
>
>         maybe genericname gets sent if CNAM turns up unknown/invalid?
>
>         On Wed, Feb 3, 2010 at 12:34 PM, David Birnbaum
>         <davidb at pins.net <mailto:davidb at pins.net>> wrote:
>              That's a mistake/misconfiguration.  I believe Canada
>         sends CNAME inband, but in the
>              US, it probably just means somebody is using a
>         client-profile PRI for a carrier
>              circuit, doing toll-bypass, or playing other games.  We
>         have seen this type of
>              misconfiguration on smaller VoIP carriers.
>
>              Time Warner may carry CNAM internal on their network so
>         they can save the money on
>              CNAM dips, but obviously that won't go far.
>
>              Cheers,
>
>              David.
>
>              -----
>
>         On Wed, 3 Feb 2010, Carlos Alvarez wrote:
>
>              Time Warner does transmit the name info that you send.
>          We have a TWTC PRI
>              and I've seen the same thing when calling another number
>         on their network. It
>              has even happened to numbers on other networks, though
>         now I can't remember
>              which ones.  One of their engineers confirmed that they
>         do this on purpose,
>              but also couldn't tell me which other networks accept
>         this from them.
>
>
>              On 2/3/10 9:24 AM, milosz wrote:
>                    hi all,
>
>                    has anyone heard of a US residential carrier
>         transmitting the
>                    callername
>                    parameter from the IAM instead of doing a normal
>         CNAM lookup?  i
>                    have
>                    some users--for whom the pbx is (intentionally) set
>         up to
>                    transmit an
>                    invalid cpn--who are claiming that when they call
>         their home
>                    phones from
>                    the office, their internal (sip) caller name
>         appears on the
>                    caller id
>                    along with the invalid cpn, which makes no sense
>         from a CNAM
>                    lookup
>                    standpoint.  the only thing i could think of (other
>         than they are
>                    nuts/lying) is that their gateway is transmitting
>         the sip
>                    callername in
>                    the IAM and the carrier is passing that along
>         instead of doing a
>                    lookup.
>                     the btn is the same for all users so that can be
>         ruled out.
>
>                    they are all on cablevision or time warner.
>
>                    thanks,
>
>                    milosz
>
>
>
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>
>              --
>              Carlos Alvarez
>              TelEvolve
>              602-889-3003
>
>              Advanced phone services simplified
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