Spectralink 84-Series Series Wireless Telephones Administration Guide
1725-86984-000_P.docx
September 2016
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The second, and preferred, method is to signal the media directions with the “a” SDP media
attributes sendonly, recvonly, inactive, or sendrecv. The hold signaling method used by the
handset is configurable is configurable using the
voIpProt.SIP.useRFC2543hold
), but both methods are supported when signaled by the remote end
point.
Hold Methods
Even if the handset is set to use c=0.0.0.0, it will not do so if it gets any sendrecv,
sendonly, or inactive from the server. These flags will cause it to revert to the other
hold method.
Reliability of Provisional Responses
The handset fully supports RFC 3262 -
Reliability of Provisional Responses
.
Transfer
The handset supports transfer using the REFER method specified in draft-ietf-sip-cc-transfer-05
and RFC 3515.
Third party call control
The handset supports the delayed media negotiations (INVITE without SDP) associated with
third-party call-control applications.
When used with an appropriate server, the User Agent Computer Supported
Telecommunications Applications (uaCSTA) feature on the handset may be used for remote
control of the handset from computer applications such as Microsoft Office Communicator.
The handset
is compliant with “Using CSTA for SIP Phone User Agents (uaCSTA), ECMA
TR/087” for the Answer Call, Hold Call, and Retrieve Call functions and “Services for Computer
Supported Telecommunications Applications Phase III, ECMA
– 269” for the Conference Call
function.
This feature is enabled by configuration parameters described in the SIP parameter table in the
section and
and needs to be activated by a feature application key.
SIP for Instant Messaging and Presence
The handset is compatible with the Presence and Instant Messaging features of Microsoft
Windows Messenger 5.1.