How to intercept CANCEL and change fu&tu

[CzyerChen]

Hello, I am green hand here.
In my case, with topology_hiding and fU&tU rewrite, I have to mask initial fU & tU when proxying sip messages. All succeed, but CANCEL message inited locally by server, I can not change fu & tu, If I do it manually, tm can not match. Any suggestions?

thing I have:

CANCEL sip:[email protected]:5060 SIP/2.0                                                                                 
Via: SIP/2.0/UDP proxy.domain:5060;branch=z9hG4bK932b.33154787.0                                                                              
From: <sip:[email protected]>;tag=877556c1e3e94f9da53100d72eefa195                                                                        
Call-ID: TArYzB5EQMMZ3w1Yi5JAwtle2Bne0QGXmovMTc-                                                                                    
To: <sip:[email protected]>                                                                                                      
CSeq: 26759 CANCEL                                                                                                                             
Max-Forwards: 70                                                                                                                               
Reason: SIP;cause=487;text="ORIGINATOR_CANCEL"                                                                                                 
User-Agent: OpenSIPS (3.5.2 (x86_64/linux))                                                                                                    
Content-Length: 0  

thing I want:

CANCEL sip:[email protected]:5060 SIP/2.0                                                                                 
Via: SIP/2.0/UDP proxy.domain:5060;branch=z9hG4bK932b.33154787.0                                                                              
From: <sip:[email protected]>;tag=877556c1e3e94f9da53100d72eefa195                                                                        
Call-ID: TArYzB5EQMMZ3w1Yi5JAwtle2Bne0QGXmovMTc-                                                                                    
To: <sip:[email protected]>                                                                                                      
CSeq: 26759 CANCEL                                                                                                                             
Max-Forwards: 70                                                                                                                               
Reason: SIP;cause=487;text="ORIGINATOR_CANCEL"                                                                                                 
User-Agent: OpenSIPS (3.5.2 (x86_64/linux))                                                                                                    
Content-Length: 0  

[github-actions]

Any updates here? No progress has been made in the last 15 days, marking as stale. Will close this issue if no further updates are made in the next 30 days.