Portech MV-370, User Manual

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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-Attempt directly. (For this function, 183 must be
turn on)
11.7.3 183(Session Progress)-->[It means"on progressing"] : When you
turn 183 on, it means you can hear Voice-Attempt while GMS side are
busying. We recommend you to turn this on if you use SIP Proxy.
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