[VoiceOps] Do Not Call list

[Jason L. Nesheim]

One route you could take is using an ENUM or SIP redirect server to query the destination number against a database and return a route that blocks the call. There are a quire a few directions could go on the ENUM side to do this. Something along the lines of NetNumber is one option, otherwise you can do something in house to store and query the database. It's possible to put together a fairly cheap and reliable database backed ENUM platform with something as simple as a pair of servers running a database backed DNS (PowerDNS is an option) and replicated MySQL/PostgreSQL. With a decent amount of RAM you could store the entire database in memory cache for quick response times. 




-- 
Jason Nesheim 




----- Original Message ----- 
From: "Jay Hennigan" <jay at west.net> 
To: voiceops at voiceops.org 
Sent: Friday, December 2, 2011 3:48:53 PM 
Subject: Re: [VoiceOps] Do Not Call list 

On 12/2/11 3:26 PM, Jimmy Hess wrote: 

> Since you're making a call to an outside service, then you'll have a 
> question to deal with... 
> what do you want to happen if the remote server can't answer your 
> query, your internet connectivity 
> to the remote server has an issue, or the remote service is taking way 
> too long to respond. 
> 
> Failed query, then allow? Failed query, then block? Failed query, 
> then retry forever? 
> If the database server is temporarily unavailable, then you have to 
> pick how you want to fail. 
> 
> Careful about the risk of potentially making an outgoing 911 call sit 
> and wait 10 minutes on 
> a query to a remote database, to see if the call will be allowed, b/c 
> database happens to be 
> experiencing a speed issue at the time. 

Yeah, whole different scenario with a human agent vs. an autodialer. 

Presumably these are agents with a SIP trunk to a telemarketing system 
and not generic business users. With the Sansay you can deploy a 
blocking server based on the resource, so 911 and other service codes 
would not use it, only NPA-NXX-XXXX. 

If the trunk is used only for outbound telespam^H^H^H^Hmarketing, then 
logically you would probably want to reject on unreachable. Sansay is 
pretty flexible in terms of ability to use multiple blocking servers. 


-- 
Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net 
Impulse Internet Service - http://www.impulse.net/ 
Your local telephone and internet company - 805 884-6323 - WB6RDV 
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