[VoiceOps] Level3 Vector Network - Inbound Failover

Geoff Mina gmina at connectfirst.com
Wed Sep 1 17:09:35 EDT 2010

Interesting.  Are both of you on the Vector /Sonus network?  I know for a
fact Sonus switches can do what I'm asking. so I'm not sure why they
wouldn't choose to use that feature.


Geoff MINA 
Chief Technical Officer

Connect First Inc. 
P: 678.905.0671

T: 888.410.3071

F: 678.265.1158

E:  <mailto:gmina at connectfirst.com> gmina at connectfirst.com
 <http://www.connectfirst.com/> www.connectfirst.com




From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org]
On Behalf Of Peter Fabian
Sent: Wednesday, September 01, 2010 4:33 PM
To: Alex Balashov
Cc: voiceops at voiceops.org
Subject: Re: [VoiceOps] Level3 Vector Network - Inbound Failover


I have been fighting this same thing for the last month or so.  L3 has told
me that the only option that they have is the hard set 25 second timer with
BNA.  They have also told me that they do not support rerouting on 503's.
As for the BNAO settings, I was told they had attempted to implement a
better solution but it did not work well and so they are back to the process
of evaluating alternate methods


Peter Fabian | Senior Voice Engineer | Telesphere | P: 4803857059 | F:

On Wed, Sep 1, 2010 at 1:27 PM, Alex Balashov <abalashov at evaristesys.com>

They should be able to fail over on a 503.  But not a 603, for the reason
that 6xx-class errors are semantically different.

On 09/01/2010 03:01 PM, Geoff Mina wrote:

I am currently setting up Level3 as a provider of SIP Toll-Free
services.  I am hearing from my account team that they don't have any
option other than their BusyNoAnswer option to failover from one SIP IP
(on my side) to another. If I send back a 486 or there is a timeout they
can failover to a second trunk. Unfortunately, they can't decouple the
486 and timeout scenarios. and that doesn't work, because 486 is a
normal non-error condition on my network and I wouldn't want the call to
be re-presented to another location just because the first location sent

I have asked them if they can failover on 5XX errors or internally
generated 408, but they seem to think they are unable to do anything
like this.

Anyone have any experience with Level3 in this scenario?



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