Hi David, thanks for the reply.
Unfortunately, a "private" network doesn't necessarily mean dedicated
infrastructure. Their documentation explicitly states that "ESInets may
be constructed from a mix of dedicated and shared facilities." So it
seems like it should be in NENA's best interest to follow the de facto
standard to ensure operation over shared facilities.
Thanks,
-Brian
On 2020-03-17 17:45, Hiers, David wrote:
Hi Brian,
That standard applies to " Emergency Services IP Networks", which, by
definition, are entirely private. They control their entire
universe; there is simply no reason for NENA to care about default
behavior of any device or network.
As to why they picked these values... I have no idea, but they
defined 'most networks' as out of scope, so why not?
David
-----Original Message-----
From: VoiceOps [mailto:[email protected]] On Behalf Of
Brian Knight
Sent: Tuesday, March 17, 2020 2:22 PM
To: Voiceops <[email protected]>
Subject: [VoiceOps] NENA SIP Marking Specifications
I have been working to deploy a new private WAN for a customer that
services E911 emergency calls delivered over VoIP. While working on
this, I learned that their DSCP markings for SIP control traffic are
AF12, not AF31 or CS3 which is what I typically see from our other
enterprise customers. Media is still marked EF.
These markings appear to have been standardized by a body called NENA,
National Emergency Number Association. Googling 'NENA SIP "AF12"'
returns the relevant PDFs. Below is a sample from their standards
guide.
DSCP | Use | PHB
-----+----------------------------------+--------
0 | Routine Traffic | Default
1 | 9-1-1 Signaling | AF12
2 | 9-1-1 Text Media | AF12
3 | 9-1-1 Audio Media | EF
4 | 9-1-1 Video Media | AF11
5 | 9-1-1 Non-human-initiated Call | AF21
6 | Intra ESInet* Events | AF21
7 | Intra ESInet Other 9-1-1 Traffic | AF22
(* Emergency Services IP Network)
Does anyone know the reasoning behind specifying SIP as AF12 instead
of AF31? While developing these standards, was NENA aware that AF12
tends to be prioritized lower than AF31 on most networks?
Just trying to get some background on the decision.
Thanks,
-Brian
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