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Administrator’s Guide - SoundPoint
®
IP / SoundStation
®
IP Session Initiation Protocol (SIP)
Copyright © 2006 Polycom, Inc. 169
5.1.4.6 6xx Responses - Global Failure
5.1.5 Hold Implementation
The phone supports both currently accepted means of signaling hold. The first method,
no longer recommended due in part to the RTCP problems associated with it, is to set
the “c” destination addresses for the media streams in the SDP to zero, for example,
c=0.0.0.0. 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 phone is configurable (for more information, refer to 4.6.1.1.4 SIP
<SIP/> on page 88) but both methods are supported when signaled by the remote end
point.
5.1.6 Reliability of Provisional Responses
The phone fully supports RFC 3262 - Reliability of Provisional Responses.
5.1.7 Transfer
The phone supports transfer using the REFER method specified in draft-ietf-sip-cc-
transfer-05 and RFC 3515.
5.1.8 Third Party Call Control
The phone supports the delayed media negotiations (INVITE without SDP) associated
with third party call control applications.
Response Supported Notes
600 Busy Everywhere No
603 Decline Yes
604 Does Not Exist Anywhere No
606 Not Acceptable No