FAQ/How can I setup snom3xx phones for TLS support

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Configure the outbound proxy of your account with a "transport=tls" parameter i.e.:

  • Registrar: a@b.com
  • Outbound proxy:;transport=tls

Basically no special setting is needed on the phone for using TLS since the phone does not listen for TLS connections on any port. It only acts as a TLS client for SIPS connections and therefore sets up and maintains persistent TLS connections to the proxy/registrar for the period of the registration.

  • The "Network identity port" setting is for static SIP udp/tcp port assignment and has no effect on TLS.
  • The "Listen on SIP TCP port" setting is only for TCP.
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