OnSIP has no experience with this specific firewall and does not have one in-house to test with. An OnSIP customer supplied this specific link on how to disable SIP ALG on a Palo Alto. Any specific questions and/or troubleshooting should be directed to the manufacturer:
https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClEsCAK
December 2020
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