[OpenSIPS-Users] how to modify a Via header?

[CheeWii]

Hi!

   Now I use opensips as a v4-v6 gateway.so I want to change every ipv4
address in VIA header to ipv6 address. How can I accomplish this?
   For example：
   Via: SIP/2.0/UDP 192.25.132.227:5069;branch=z9hG4bKdf6e.49b8c2c2.0

   --------->
   Via: SIP/2.0/UDP
[2002:da8:214:1115:b0cc:8604:1fc9:6448]:5069;branch=z9hG4bKdf6e.49b8c2c2.0

Thanks a lot！
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