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Intermediate Communication issue in Voice Calls

Communication for voice traffic such as to and from expressway and phones was working fine since past few months. Suddenly it is being reported that users from home are experiencing intermediate issue in voice calls .. in the logs i can see all traffic being allowed but there is an Alert along with Allow message in some of the these logs.(mentioned below)

Firewall - Protocol violation detected with protocol:(RTP), matched protocol sig_id:(1), violation sig_id:(9). (500)

i am not sure if the issue is related to firewall or voice devices Firewall is not showing any drops related to this traffic... but i dont understand this Alert.

These GWs were recently updated to R80.40 ..i wonder if that has anything to do with it.


Any help is appreciated . thanks

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