Cisco Webex Calling - One way calling

[matlat]

Does anyone utilize Cisco Webex Calling with a Palo Alto firewall? We run Webex calling and ever since we switched to the palo alto, calls sometimes will only go in one direction (you can hear them, they cant hear you) or no way (either sides cant hear eachother). I reverted back to PAN-OS 9.1.1 hoping that would resolve the issue but the issue still occurs

[OtakarKlier]

Hello,

Are you decrypting the traffic? If yes, try bypassing decryption for it. Also check the logs to see if anything is getting blocked between the devices.

Regards,

[SebastianHermes]

Hi Matlat, we are experiencing the same issue. How could you solve it ? 

[Brandon_Wertz]

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@SebastianHermes wrote:

Hi Matlat, we are experiencing the same issue. How could you solve it ? 

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My company used to have WebEx as our primary meeting platform. We really didn't have any issues, outside of the one off user complaints.  WebEx uses a bunch of different applications from a list of different IP networks.

I would first create an IP based rule that allowed "any application" over service "any" to the known Cisco WebEx IP networks.  Then after 2-4 weeks review the applications that matched the rule and create an application based rule above your IP (L3) based rule.  What I suspect is going on is you're probably not allowing the "stun" application or some other media based application which is causing your audio issues.  Following the suggested method above will be a much easier way of troubleshooting.  Only do this of course following your internal approval processes for allowing traffic through your firewall.