I have configured some SIP TRUNKs and works well. My question is if there is a way where if my wan failure the calls could re route through PSTN?
I was reading AAR but it says that this options is used only when Location CAC isn't sufficent.
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Yes you can do that. For this you would need to add the RG that the PSTN VGW is in as the second option in the RL used and make sure that the called and calling number format is set to what ever your PSTN connection require.
Ok I understand about to add gw to pstn as secound option but what about the digit manipulation in this case?
Because numbers by wan are simple example 1XXX and you should know this are complety different in pstn where the numbers begin with 9