Based on how things work in Canada, but should not be much different for you. 
Two common scenarios:

Often class 4/5 switches or STPs are configured to cache LRN records either for 
X number of minutes or hours. Thus reducing number of dips it has to make. I 
think of it like dns caching. When particular record expires it would dip 
again. X would differ by carrier, so you cant tell for sure and cant fix that 
other than wait

Sometimes a  number is not removed from a local switch it used to be programmed 
in. So even after LRN is changed, other ppl in that same switch will hit the 
old / disconnected line. But all other callers will reach you no problem. This 
is because older switches do local subscriber lookup before doing LRN dip... so 
if there is a bogus local record it will win over anything LRN related. This 
issue would be isolated to single switch / single carrier and wont resolve by 
itself until someone removes the number programming.

> On Jan 23, 2020, at 12:45, Glen Gerhard <[email protected]> wrote:
> 
> I would expect that mobile providers would have up to date porting 
> information, regardless of how you initiate the port.
> 
> Apparently the some of the ones you tested on use a nightly update, so as 
> Matt said, you will just have to wait.
> 
> ~Glen
> 
>> On 1/23/2020 8:55, Matthew Yaklin wrote:
>> Isn't this a case of the "sloppy" providers using a LNP cache system on 
>> their switch and you simply have to wait for it to expire out for each 
>> number? Once it expires they will redip for the proper LRN and calls flow 
>> normally...
>> 
>> I guess it happens to me but I simply ignore it.. it will fix itself. I 
>> normally do ports in the evening and that way we have a solid 12 plus hours 
>> before they open the next morning.
>> 
>> Or did I misread the question and gave a terrible answer?
>> 
>> Matt
>> 
>> Matthew Yaklin
>> Network Engineer
>> FirstLight
>> 359 Corporate Drive │ Portsmouth, NH 03801
>> Mobile 603-845-5031
>> [email protected] | www.firstlight.net
>> This email may contain FirstLight confidential and/or privileged 
>> information. If you are not the intended recipient, you are directed
>> not to read, disclose or otherwise use this transmission and to immediately 
>> delete same. Delivery of this message is not intended
>> to waive any applicable privileges.
>> 
>> From: VoiceOps <[email protected]> on behalf of Mike Hammett 
>> <[email protected]>
>> Sent: Thursday, January 23, 2020 11:42 AM
>> To: voiceops <[email protected]>
>> Subject: [VoiceOps] Post-Port Activation Delay
>>  
>> I would like to preface this email by saying that I know that iconnectiv is 
>> managing ports now, but we just have the old Neustar portal working as the 
>> front end because I haven't had time to learn how all this stuff works so 
>> that I can properly train our employees on how to use the new portal.
>> 
>> 
>> Undo business. Our people that manage the porting currently go into the 
>> neustar portal and activate a port. At that time, some carriers immediately 
>> start using bus. However, some carriers will still send traffic to the 
>> losing provider for some amount of time after that. Sometimes that is okay, 
>> sometimes it is not. I assume that there is not a darn thing that I can do 
>> about how quickly someone else decides to look up the number to see that it 
>> has been ported.
>> 
>> However, can someone explain to me how common this is and what providers 
>> arnone for being sloppy? For example, last night we did a port at 9 pm. A 
>> test call that we did to a forwarding number that would have bounced through 
>> AT&T ILEC went through fine every time. Calls that would have gone through a 
>> variety of cell providers was extremely Hit or Miss, Even from the same 
>> operator.
>> 
>> 
>> I apologize for any misused words. I was using voice to text and editing 
>> that on my phone can be difficult.
>> 
>> 
>> 
>> -----
>> Mike Hammett
>> Intelligent Computing Solutions
>> http://www.ics-il.com
>> 
>> 
>> 
>> Midwest Internet Exchange
>> http://www.midwest-ix.com
>> 
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> 
> -- 
> Glen Gerhard
> [email protected]
> 858.324.4536
> 
> Cognexus, LLC
> 7891 Avenida Kirjah
> San Diego, CA 92037
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