Intermittent static on inbound and outbound calls for several months.

Doc ID		SOLN277226
Version:		1.0
Status:		Published
Published date:		11 Nov 2015

Author:

Juan Gabriel Ayala Cedillo

Details

VCM -016-03.0.124.0 patch 21898.

Ipphones 4610 FW 2.9020

Problem Clarification

Intermittent static on inbound and outbound calls for several months but it happens only for one specific Media Gateway location via wan network, all other remote Media Gateways locations works correct.

Cause

It was collected CM/MST and wireshark capture Ipphone side most recurrent issue reported.

Per Wireshark under issue reported contains for rtp frames.

Delta time starts correct without no delay 0.000 increasing until 14, 20 and highest 201.85 seconds with timeout messages.

Avaya ip´s that appears in captures has Cisco Mac address so Cisco devices who are doing L3 network communication shows one way DSCP=Precedence immediate ( not really to be used for RTP/audio ) and other way DSCP=46 expedited forwarding.

Solution

Provide findings to customer and customer review all logical/physical network devices connectivity and customer was able to find data devices that were providing DSCP=Precendence immediate it were reconfigured to 46 and after that static and bad noise intermittent fixed.

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