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SIP ALG may disrupt WiFi calling for cellphones connected to the network.
Point-to-Point Tunneling Protocol (PPTP) is a module for
implementing virtual private networks.
Layer 2 Tunneling Protocol (L2TP) is a tunneling protocol
used to support virtual private networks (VPNs) or as part of
the delivery of services by ISPs.
Internet Protocol Security (IPsec) is a protocol suite for
securing Internet Protocol (IP) communications by
authenticating and encrypting each IP packet of a
communication session.
File Transfer Protocol is a widely and commonly used
method of exchanging files over IP networks. The FTP ALG