SpoTel Series Voice Gateway:-‐ User Manual244.8.3 SIP ParameterFigure 4.8-3 SIP Parameter Configuration InterfaceSIP parameter description:SUBSCRIBE for MWI Voicemail message indicator, it is to be realized in the wayof NOTIFYVoicemail User ID Access code to voicemail boxRTP Mode in SDP when Call HoldingWhen call come into holding, if select to receive and not sendpacket, then the local can hear call waiting tone. If select tonot receive and not send packet, then doesn’t play call waitingtone.IP-to-IP Call Enable this function, users may use the * business call IPaddress on the phone.URI Includes user=phone SIP carries the information, the system defaults not open.Only Accept Call from Server Default is no, it indicates the ATA accept incoming call fromSIP server only