Function extract_status_code

src/sip/parser.rs:386–400

提取响应状态码 从 SIP 响应消息的第一行提取状态码

(msg: &str)

///
/// 从 SIP 响应消息的第一行提取状态码
pub fn extract_status_code(msg: &str) -> Option<u16> {
    let first_line = msg.lines().next()?;
    let trimmed = first_line.trim();

    if !trimmed.starts_with("SIP/2.0") {
        return None;
    }

    let parts: Vec<&str> = trimmed.split_whitespace().collect();
    if parts.len() >= 2 {
        parts[1].parse().ok()
    } else {
        None
    }
}

/// 提取 Via 分支参数
pub fn extract_via_branch(msg: &str) -> Option<String> {