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response_destination

sipx_transport::target

Function response_destination 

Source 
pub fn response_destination(
    via: &Via,
    source: SocketAddr,
    transport: TransportKind,
) -> Target
Expand description

Where a response to this request must be sent (RFC 3261 §18.2.2).

The order is the RFC’s and each step exists for a reason: maddr is an explicit override, received is where the request actually came from as opposed to where the sender believed it was, and the sent-by is what the sender claims. Behind a NAT only received is true, which is why the fallback order matters more than it looks.