2N Helios IP Configuration Manual v2.8.1 - Manual (Page 64)

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Proxy address – set the SIP Proxy IP address or domain name.
Proxy port – set the SIP Proxy port (typically 5060).
Registration enabled – enable intercom registration with the set SIP Registrar.
Registrar address – set the SIP Registrar IP address or domain name.
Registrar port – set the SIP Registrar port (typically 5060).
Registration expires – define the registration expiry, which affects the network
and SIP Registrar load by periodically sent registration requirements. The SIP
Registrar can modify the expiry limit without letting you know.
SIP transport protocol – set the SIP communication protocol: UDP (default),
TCP or TLS.