Jitter when making Phone calls

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Jitter when making Phone calls

L2 Linker

Hi Experts

The client is reporting Latency/Jitter when making the phone calls which is traversing through the PA firewalls 5220. We've QOS policy configured for the RTP/SIP applications (User/Zone is set to 'any') with Class 1(real-time) . Also, we've configured a Guaranteed Egress of 5000Mbps for this Class1 traffic under QOS profile which is applied on the Egress Interface to ensure this is classified on high priority which is reflecting when checking under statistics as well.

Can someone please assist what to check and how to proceed to take it up further. Thanks in advance.




Community Team Member

Hi @nsrini1991 ,


A good place to start is the grab the traffic for analysis and check for drop packets.


The following KB has an example on what information to collect exactly:



Hope this helps,


LIVEcommunity team member, CISSP
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