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SmartLink 4020 Getting Started Guide 6 • Telephony
SIP Extensions
Figure 25. SIP Extensions section of the SIP window
Support PRACK method
Select to enable SIP provisional acknowledgement (PRACK) support as defined in RFC 3262.
Encode SIP URI with user parameter
Select to encode user=phone parameter in SIP URI.
Send INVITE with Timer header
Select to encode Timer header in all INVITE requests for ringing timeout.
Call Hold using C=0.0.0.0
When checked, calls will be held using the call hold method described in RFC 2543. If unchecked, the call
hold would follow the RFC 3263 method.
Send NOTIFY
Send out SIP NOTIFY request to transferer for unattended and attended call transfer.
RTP Telephone Event Configuration
This sub-page allows configuration of the out-of-band signaling options for SIP. Select whether OOB tele-
phone event signaling is to be done using the SIP INFO message, or to be done via RFC2833 RTP signaling.
For additional information please refer RFC2833.
Figure 26. RTP Telephone Event Configuration section of the SIP window
VoIP VLAN Configuration
This sub-page allows configuration of specific VLAN tags that are to be applied to all SIP signalling and RTP
packets used for VoIP calls. These VLAN settings will override any general VLAN settings applied to
the interface.