[VoiceOps] IAM callername instead of CNAM

milosz mewash at gmail.com
Wed Feb 3 13:24:51 EST 2010

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> 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
>>> _______________________________________________
>>> VoiceOps mailing list
>>> VoiceOps at voiceops.org
>>> https://puck.nether.net/mailman/listinfo/voiceops
>> --
>> Carlos Alvarez
>> TelEvolve
>> 602-889-3003
>> Advanced phone services simplified
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