I have multiple ip addresses at my kamailio. I use uac module for registration to sip providers. I have one provider but want to register form different ip addresses used by my server. When register sends it takes ip address form reg_contact_addr(). But if I want to register from another interface with different ip i need to get to this parametr another ip address. So As I understand it imposibleto do with avp. Does kamailio have some methods to do this?