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12.7 SIP Responses
12.7.1 486(busy here), 503(Service unavailable): When Device is busy,
you can select 486 or 505 to response to SIP.
12.7.2 180 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 Prompt voice directly. (For this function, 183 must be
turn on)
12.7.3 183(Session Progress)-->[It means"on progressing"] : When you
turn 183 on, it means you can hear voicemail while GMS side is
busy. We recommend you to turn this on if you use SIP Proxy.
VoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299