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11.7 SIP Setting: SIP Responses
11.7.1 486(busy here), 503(Service unavailable): When Device are
busying, you can select 486 or 505 to response to SIP.
11.7.2 180 Ring on/off: LAN TO MOBILE two stage dialing can be
turn off, therefore there will be no the Ring Back Tone, all the phone
call will be transferred to Voice-Mail directly. (For this function, 183
must be turn on)