ZyXEL Communications P-2302R-P1 - Manual (Page 92)

P2302R-P1 Support Notes
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
2007 ZyXEL Communications Corporation.
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tone when you have a voice message(s). Your VoIP service provider must have a messaging system that sends
message waiting status SIP packets as defined in RFC 3842.
MWI Call flow:
You may configure MWI feature easily on P2302R-P1 web GUI: VoIP > Advanced Settings
Music on hold
This feature allows you to put a call on hold and have the other person hear a piece of audio (music, speech, etc.)
you previously recorded.
Application Scenarios:
When one side (A) presses flash or reserve key to put a call on hold, the peer side (B) will receive INVITE
packet with zero IP address in SDP to inform there is no need to send RTP out any more (RFC2543) or change
the attribute field in SDP to recvonly (RFC3261). Phone A generates pre-recorded music from IVR to phone B
directly.