Chapter 5 System screens 91Nortel Business Secure Router 222 Configuration — BasicsTable 13 describes the labels in Figure 18.Table 13 ALGLabel DescriptionEnable FTPALGSelect this check box to allow FTP (File Transfer Protocol) to send andreceive files through the Business Secure Router.Enable H.323ALGSelect this check box to allow applications using H.323 to go throughthe Business Secure Router.H.323 is an application layer control (signaling) protocol that handlesthe setting up, altering and tearing down of voice and multimediasessions over the Internet. H.323 is used in VoIP (Voice over IP), thesending of voice signals over the Internet Protocol.The H.323 ALG does not support H.323 Gatekeeper.Enable SIP ALG Select this check box to allow SIP (Session Initiation Protocol)applications to go through the Business Secure Router.The Session Initiation Protocol (SIP) is an application layer control(signaling) protocol that handles the setting up, altering and tearingdown of voice and multimedia sessions over the Internet. SIP is used inVoIP (Voice over IP), the sending of voice signals over the InternetProtocol.To avoid retranslating the SIP device's IP address, do not use the SIPALG with a SIP device that is using STUN (Simple Traversal of UserDatagram Protocol (UDP) through NAT).Apply Click Apply to save your changes to the Business Secure Router.Reset Click Reset to begin configuring this screen afresh.
