2N Helios IP Configuration Manual page 74

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.
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