Understood, in our environment, if we disabled the SIP application ALG, it will break other VoIP applications.
Disabling the SIP ALG under Objects / Applications / SIP, disables it for the entire firewall.
Using an Application Override (while doing some other things) also has the effect of disabling the SIP ALG.
Both methods are acceptable workarounds depending on your environments.
Just to bump this thread... On SW version 8.0.10, that was the fix for me as well. Override SIP-ALG and it should work fine.
It worked for me as well. Thanks for posting your solution! Objects->Applications->SIP->ALG->Customize->Disable
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