Local RTP Port
Configures the local RTP port used to listen and transmit. The valid range is 1024 to 65400 and it must
be even.
Local RTP Port Range Configures the range of local RTP port. Valid value is from 24 to 10000.
Use Random Port
If set to "Yes", the parameter will force random generation of both the local SIP and RTP ports. This is
usually necessary when multiple phones are behind the same full cone NAT. This parameter must be set
to "No" for incoming direct IP calls (outgoing IP calls are not affected).
Keep-Alive Interval
Specifies how often the phone sends a blank UDP packet to the SIP server in order to keep "ping hole"
on the NAT router to open.
STUN Server
This option sets IP address or Domain name of the STUN server. Only non-symmetric NAT routers
work with STUN.
Use NAT IP
Configures the NAT IP address used in SIP/SDP messages. It should ONLY be used if required by your
ITSP.
Delay Registration Configures the specific time that the account will be registered after booting up.
Enable Outbound Notification Configures whether to enable outbound notifications such as Action URL.
General
Preferred Default Account
Select the preferred default account for on-hook or off-hook dialing. when the selected
account is unavailable, system will use the first available account to dial out.
Mute Key Functions While Idle
If set to 'Idle Mute", clicking the MUTE key while idle will cause the phone to be muted
automatically when answering incoming calls.
Do Not Escape '#' as %23 in SIP URI Replaces # by %23 for some special situations.
User-Agent Prefix Configures the prefix in the User-Agent header
Outgoing
Enable Direct IP Call Enables Direct IP Call feature.
Onhook Dial Barging When the option is set to "Disabled", onhook dialing won't be interrupted by an incoming call.
Off-hook Auto Dial Configures the digits to be dialed via the first account when the phone is off-hook.
Off-hook Auto Dial Delay
Configures the timeout (in seconds) for off-hook auo dial. Valid range is 0-10. If set to 0, it
will be dialed out immediately. Otherwise, it will be dialed out after the configured timeout.
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