[SR-Users] Tips on picking random element from a list
Ben Kaufman
bkaufman at bcmone.com
Thu May 5 01:03:50 CEST 2022
Without any external dependencies. Not sure how you're populating your pool of numbers for the caller id, but this generally works:
```
## Populate your list however you want:
$(avp(cid)) = "15555551000";
$(avp(cid)) = "15555551001";
$(avp(cid)) = "15555551002";
$(avp(cid)) = "15555551003";
$(avp(cid)) = "15555551004";
$(avp(cid)) = "15555551005";
$(avp(cid)) = "15555551006";
## $avp(cid) now holds 7 values.
## A random integer using the remainder $RANDOM divided by the number of
## elements:
$var(rand) = $RANDOM mod $cnt($avp(cid));
## Use the random integer to get the CID out of the list
$var(rand_cid) = $(avp(cid)[$var(rand)]);
```
Ben Kaufman
Sr. VoIP Engineer - BCM One
+1.612.735.9309
bkaufman at bcmone.com
24 hour client support: +1.855.639.6300
-----Original Message-----
From: sr-users <sr-users-bounces at lists.kamailio.org> On Behalf Of Fred Posner
Sent: Wednesday, May 4, 2022 3:02 PM
To: sr-users at lists.kamailio.org
Subject: Re: [SR-Users] Tips on picking random element from a list
If you were choosing random numbers from a pool of numbers, you could always lets say store the caller-id's in redis, connect kamailio to redis, and just use the RANDOMKEY function of redis to return a caller id.
Fred Posner | palner.com
o: +1 (212) 937-7844
On 5/4/22 15:43, Ben Kaufman wrote:
> How "random" do you need to be here? Given your example, a quick
> thought would be to just iterate over a list, using a counter and
> calculating the modulo (remainder) when dividing it by the number of elements you have.
>
> Another thought would be to use the core_hash() function over the
> call-id.
> https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.k
> amailio.org%2Fdocs%2Fmodules%2F5.6.x%2Fmodules%2Fcfgutils.html%23cfgut
> ils.f.core_hash&data=05%7C01%7Cbkaufman%40bcmone.com%7C233860f6470
> 7428040a008da2e090ef7%7Cafc1818e7b6848568913201b9396c4fc%7C1%7C0%7C637
> 872913679726971%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2
> luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=zdoWq%2
> FANIgusBipnbAD4%2BJpDzMc6fNrilEawt5rV2f8%3D&reserved=0
> <https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.
> kamailio.org%2Fdocs%2Fmodules%2F5.6.x%2Fmodules%2Fcfgutils.html%23cfgu
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> 07428040a008da2e090ef7%7Cafc1818e7b6848568913201b9396c4fc%7C1%7C0%7C63
> 7872913679726971%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV
> 2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=zdoWq%
> 2FANIgusBipnbAD4%2BJpDzMc6fNrilEawt5rV2f8%3D&reserved=0>
>
> Of course, those aren't really "random" in the mathematical sense, but
> if you're goal is "you have a pool of 10 numbers and want them to be
> assigned to the p-asserted-identity URI user each one-tenth of the
> time", either of the above methods should work. Hashing the call-id
> would even ensure that the same call will get the same value if you
> have to recalculate it.
>
> *Ben Kaufman*
>
> /Sr. VoIP Engineer - BCM One/
>
> +1.612.735.9309
>
> bkaufman at bcmone.com <mailto:bkaufman at bcmone.com>
>
> 24 hour client support: +1.855.639.6300
>
> *From:* sr-users <sr-users-bounces at lists.kamailio.org> *On Behalf Of
> *Joel Serrano
> *Sent:* Tuesday, May 3, 2022 8:40 PM
> *To:* Henning Westerholt <hw at gilawa.com>
> *Cc:* Kamailio (SER) - Users Mailing List
> <sr-users at lists.kamailio.org>
> *Subject:* Re: [SR-Users] Tips on picking random element from a list
>
> I did, but I don't see how to limit the range:
>
> From the docs: Returns a random value from the [0 - 2^31) range.
>
> Is there a way to limit the range from 1-100 for example? Or maybe the
> way is to use $RANDOM and just rely on the first/last 2 digits
> (essentially a 00-99 range)?
>
> On Tue, May 3, 2022 at 10:40 AM Henning Westerholt <hw at gilawa.com
> <mailto:hw at gilawa.com>> wrote:
>
> Hello,
>
> what about just using this PV:
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fkamailio.org%2Fdocs%2Fmodules%2F5.5.x%2Fmodules%2Fcfgutils.html%23idm438&data=05%7C01%7Cbkaufman%40bcmone.com%7C233860f64707428040a008da2e090ef7%7Cafc1818e7b6848568913201b9396c4fc%7C1%7C0%7C637872913679726971%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=qW9OEMTf1MeQl%2FRKqRLah4WLQAogKViHQeS%2FRZTqgN0%3D&reserved=0
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> Cheers,
>
> Henning
>
> --
>
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> *From:*sr-users <sr-users-bounces at lists.kamailio.org
> <mailto:sr-users-bounces at lists.kamailio.org>> *On Behalf Of *Joel
> Serrano
> *Sent:* Tuesday, May 3, 2022 6:20 PM
> *To:* Kamailio (SER) - Users Mailing List
> <sr-users at lists.kamailio.org <mailto:sr-users at lists.kamailio.org>>
> *Subject:* [SR-Users] Tips on picking random element from a list
>
> Hi Everyone,
>
> I have to implement a flow where outbound calls get their caller-id
> set with a random number from a pool.
>
> I've been looking around and, as most of the time, there are tons of
> ways to implement something like this... This is a simple
> implementation, the number pool is fixed and will not change (so I
> could have it hard-coded in the config if required).
>
> My initial approach was:
>
> 1- Try to keep it simple, with no dependencies, and all done in the
> config script.
>
> 2- If #1 is "ugly", then I'd probably go with some inline code using
> python/lua/etc
>
> 3- If #2 is "ugly", then I'd go with having the info in a DB and
> just run a query
>
> I think #2 and #3 might be overkill for something so "simple" but I
> haven't had to work too much with randomness in Kamailio, so any
> tips/suggestions on where to store the number list and how to pick
> one randomly would be awesome!
>
> Thanks!!
>
> Joel.
>
>
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