we are configuring a SIP Trunk against a Cloud PBX without a CUBE (PoC purpose). The problem I have is that for this service SIP ALG in firewal should be disabled, so when call arrives, IP received is different than CUCM IP. If we enable SIP ALG all works fine except call transfer.
I'll try to solve it adding URI with natted IP address without succes.
Any ideas to solve the problem?
What firewall are you using? Asa firepower. These are quite good when enabling sip inspection in conjunction with nattjng sip. Not sure about palo paltos