Call Options for VoIP Client in IGEL OS

You can change settings for inbound calls.

Menu path: Setup > Sessions > VoIP Client > Call Options

Always forward calls to the given address: If this option is enabled, inbound calls will immediately be forwarded to the address defined in Setup > Sessions > VoIP Client > SIP > Foward URI (see SIP) or Setup > Sessions > VoIP Client > H.323> Forward URI (see H.323).
Forward calls to the given address if no answer: If this option is enabled, inbound calls will be forwarded to the address defined in Setup > Sessions > VoIP Client > SIP > URI for Forwarding (see SIP) or Setup > Sessions > VoIP Client > H.323> URI for Forwarding (see H.323) after the time specified under Time limit for calls not taken. If this option is disabled, inbound calls will be rejected after the time specified under Time limit for calls not taken.
Forward calls to the given address if busy: If this option is enabled, inbound calls during a call will be forwarded to the address defined in Setup > Sessions > VoIP Client > SIP > URI for Forwarding (see SIP) or Setup > Sessions > VoIP Client > H.323> URI for Forwarding (see H.323).
No Answer Timeout: Time in seconds after which calls not taken are rejected or forwarded.