You can change SIP-specific settings for the proxy, forwarding and the multi-frequency dialing process (DTMF).
Menu path: Setup > Sessions > VoIP Client > SIP
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Outbound Proxy: URI of the SIP proxy that handles outbound calls.
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Forward URI: SIP URI to which inbound calls are forwarded if forwarding is enabled. You will find further information on forwarding under Call Options.
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Send DTMF as: Specifies how key sequences are transmitted while a connection is in place.
Possible values:-
INFO: The key sequence is transmitted as SIP INFO.
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RFC 2833: The key sequence is transmitted using RTP (Real-time Transport Protocol).
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