[AusNOG] Telstra NBN - DSCP Filtering

[Greg Lipschitz]

Yep, seen this one before and I believe I posted about it here previously.

Telstra are only allowing EF towards their SIP servers, thus avoiding to have to pay for the UNI-D ports and COS1 NBN traffic.
Then they’re selling a Netgear Router with a VoIP ATA Built in and essentially forcing customers to use Telstra for calls rather than another VoIP provider.

We got around this by using a non-Telstra router and re-writing the packets as they hit the router (from EF to BE) so that it would flow.

Cheers,

Greg



Greg Lipschitz | Director | The Summit Group

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From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Dino Sosic
Sent: Friday, 7 August 2015 2:02 PM
To: ausnog at lists.ausnog.net
Subject: [AusNOG] Telstra NBN - DSCP Filtering

Hi guys,

Something I discovered after an extensive tshooting. Telstra service on NBN ( TID Service ) actually drops all non 0 marked DSCP markings. They say it’s actually NBN doing that, but I do not see this on other providers. I had phones trying to register across the IPsec through that NBN, that were failing to do so as long as they were sending marked packets (phones mark it EF by default ). Once I remarked the voice traffic to DSCP 0(default), the SIP registered immediately. Some heavy traffic manipulation or what? ☺ So much for unhindered transport from A to B.
Interesting part was also, even though the voice traffic is inside the ESP packet, those packets get dropped, I am guessing due to size+DSCP marking copied to ESP packet. Anyone seen this before?

Dino
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