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Disable SIP ALG and SIP session helper by running the following commands :
1) To disable SIP ALG:
FGT# config sys setting
FGT set default-voip-alg-mode kernel-helper-based
2) To disable SIP session helper:
FGT# config sys session-helper
FGT(session-helper)#show
Find the entry which shows 'set name sip' by default it is entry number 13:
FGT(session-helper) delete 13
FGT(session-helper) end
3) Delete all the VOIP sessions, by finding the policy id which allows VoIP traffic and clearing them using the below:
FGT# diag sys session filter policy <policy-id>
FGT# diag sys session list <----- To know the number of sessions for this policy.
FGT# diag sys session clear
4) Test with an audio call.
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