[AusNOG] Procurve POE Switch RTP issues

[Mark ZZZ Smith]

Not specifically with those devices, however it sounds bit like a default QoS processing issue. If the switches (perhaps out of the box) are looking at the QoS markings on the data stream packets, and not liking them, then they'll probably drop those packets.
I've experienced switches doing QoS processing out of the box in the past by default (in that specific case, it was effectively marking them as untrusted), rather than leaving them alone (which for an ISP is an annoying default.)
Is the silence caused by packet containing silence, or is it caused by no packets being delivered?


      From: Cameron Murray <cameron.murray at gmail.com>
 To: "ausnog at ausnog.net" <ausnog at ausnog.net> 
 Sent: Thursday, 16 April 2015, 19:28
 Subject: [AusNOG] Procurve POE Switch RTP issues
   
Guys,
Sorry for the slightly off topic post but I'm stumped and 1000km from the problem.
We provisioned some Snom phones this afternoon for a customer however SIP sessions establish and calls can be signalled however the audio/rtp stream is silent in both directions.
We tested a softphone which worked correctly from inside their network.
We have concluded that the HP Procurve 2610-48 pw may be interfering with the flow however this device is blind to us and we have no access nor the customer documentation.
Has anyone seen similar issues with these devices?
Regards
Cameron
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