I did find the solution by using the next syntax: :cool:;)
[from-pstn-custom]
exten => s,1,Goto(from-trunk,${CUT(CUT(SIP_HEADER(To),@,1),:,2)},1)
[custom-Bleu-SIP-provider]
exten => s,1,Noop(Fixing DID to +491234567890 Example)
exten => s,n,Goto(from-trunk,+491234567890,1 Example)...