SIP traffic being dropped in drop.pcap on the PA with PAN OS version 10.2.4-h2

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SIP traffic being dropped in drop.pcap on the PA with PAN OS version 10.2.4-h2

L1 Bithead

SIP traffic is not working properly, we recently upgraded to PAN OS version 10.2.4-h2 and seeing issues with multiline calls

 

Steps taken:

ALG is disabled, we have already created SIP-override and RTP override but no luck.

@Param_Upadhyay @UtkarshKumar 

We then did a packet capture and found that SIP traffic flow completes fine and call works fine but when user tries to add any other user, we see a Re-invite from CUCM IP to the device IP generating the call and that traffic is being dropped in the firewall drop.pcap.

 

Didar_Bajwa_1-1690500469057.png

 

Now, as per the wireshark logs, we suspect this to be a MTU issue as payload is around 1511. As a workaround, we have removed information from the SIP profile to reduce it's size and as expected that has resolved the issue. The info I removed is display/party information so effectively I've disabled caller ID.While technically leaving it disabled is not a solution

 

But this was working fine without any issues on the previous version , so why it is being dropped in drop.pcap now on a higher version.

 

So, looking for some suggestions or insights if anyone else is facing the same issue.

 

2 REPLIES 2

Hi @Didar_Bajwa ,

The best way to understand what could be the reason for the dropped packets is to check the global counters - https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000CloNCAS

What is the output of the global counters?

nothing in the global counters

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