# Proxy parameters ### Establishing a session To maintain a consistent IP address, use the `sessionid` proxy header. The same IP will be assigned as long as possible, if it's in the pool. If the IP is no longer available or removed due to quality issues, a new IP is assigned. To reuse an IP, apply the same `sessionid` header alongside a unique identifier comprising 4 to 10 digits, like. In case you have any questions, contact us at .