[Kamailio-Users] Translate "486 Busy Here" to "600 Busy Everwhere"

[Geoffrey Mina]

I am actually having the issue with this Level3 reseller
(candbith.zom).  They have said they are forwarding the 486 upstream
and Level3 is acting on it strangely.

I guess my search continues.  I'll wait to hear what Level3 has to say
for themselves.


On Tue, Nov 10, 2009 at 12:27 PM, Alex Balashov
<abalashov at evaristesys.com> wrote:
> Geoffrey Mina wrote:
>
>> CallID: 604627041_120490736 at 4.55.20.99
>> Level3 --> INVITE --> Kamailio --> Asterisk
>> Asterisk --> 183 Progress --> Kamailio --> Level3
>> Asterisk --> 486 Busy --> Kamailio --> Level3
>> Level3 --> ACK --> Kamailio --> Asterisk
>
> I can't explain the presentation of a new and different Caller ID; that's
> bizarre.
>
> As far as failing over on response codes that really, logically should not
> be failed on, well, that's a fairly standard bit of idiocy on the part of
> virtually all the Tier 1s and/or nationwide CLECs and/or big origination
> carriers.  Their gear is just configured to roll over on any 4xx/5xx class
> errors.
>
> I'll tell you what my solution is to this problem:
>
> Since many of these origination providers don't properly map SIP replies to
> ISUP in ways that result in correspondingly meaningful messages being played
> to callers by originating switches[1], I take matters into my own hands - at
> the risk of burning up some trunks.  I have my customers run SEMS (media
> server) with their own recordings of busy signals and other messages they
> want played and have the proxy serially fork/branch to it when such a media
> rsource is needed, e.g.
>
>   append_branch();
>
>   $rU = "busy";
>   $rd = "mediaserver.ip";
>
>   t_relay();
>
> Perhaps you should investigate that as a solution to your problem;  if the
> callee is busy, "trap" the initial call leg and send it to your own feature
> box.
>
> Of course, this can burn up trunks in perpetuity if the caller doesn't hang
> up.  It is also quite undesirable if you're paying usage on inbound.
>
> -- Alex
>
> [1] One big Level3 reseller - it rhymes with candbidth.zom - reacts to all
> negative SIP replies with the propogation of a "this number is out of
> service" reply on the ISUP layer regardless of what the SIP reply code
> actually was, including 486 Busy!
>
> --
> Alex Balashov - Principal
> Evariste Systems
> Web     : http://www.evaristesys.com/
> Tel     : (+1) (678) 954-0670
> Direct  : (+1) (678) 954-0671
>