We recently had a vendor switch from Cisco SIP to PJSIP. After the migration it was necessary for us to add an access list to allow UDP port range 60000 65535. To the best of my knowledge this part of the reason we enabled SIP inspect several years ago on the Cisco ASA. I saw evidence of these ports being denies in the syslog before I added these ports to the access-list. I am sorry to report that our log history does not go back far enough to see the pack flow before the change.
Any suggestion you might have to assist me in my research would be appreciated.
ASA 5520 ASA Version 8.2(5)33
inspect rtsp
inspect sip