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If a zone's
sipSigPort is configured for
sip-tls-tcp, the SBC increments the configured
portNumber by 1 and uses it as the new port number for SIP over TLS signaling. The SBC then opens a TCP socket for SIP over TLS for the new TCP port number.
sipSigPort is configured with a
portNumber of 5060 and
sip-tls-tcp, the SBC listens on TCP port 5061 for SIP over TLS.