Polycom Version 1.4.x 17 - Manual (Page 140)

Administrator Guide - SoundPoint ® IP / SoundStation ® IP Session Initiation Protocol (SIP)
132 Copyright © 2004 Polycom, Inc.
5.1.3 Header Support
In the following table, a “Yes” in the Supported column means the header is sent and
properly parsed.
OPTIONS Yes
SUBSCRIBE Yes
NOTIFY Yes
REFER Yes
PRACK Yes
Header Supported Notes
Accept Yes
Accept-Encoding No
Accept-Language No
Alert-Info Yes
Allow Yes
Allow-Events Yes
Authentication-Info No
Authorization Yes
Call-ID Yes
Call-Info Yes
Contact Yes
Content-Disposition No
Content-Encoding No
Content-Language No
Content-Length Yes
Content-Type Yes
CSeq Yes
Date No
Diversion Yes
Method Supported Notes