User's Manual

SIP header fields
The following table contains the supported SIP headers.
Header field Supported?
Accept Yes
Accept-Encoding Yes
Accept-Language Yes
Alert-Info Yes
Allow Yes
Allow-Events Yes
Authentication-Info Yes
Authorization Yes
Call-Id Yes
Call-Info Yes
Contact Yes
Content-Disposition Yes
Content-Encoding Yes
Content-Length Yes
Content-Type Yes
Cseq Yes
Date Yes
Expires Yes
Error-Info Yes
Max-Forwards Yes
Mime-Version Yes
Organization Yes
P-Access-Network-Info Yes
P-Asserted-Identity Yes
P-Associated-URI Yes
P-Called-Party-ID Yes
SIP messages supported by the IP Deskphone
218 SIP Software for Avaya 1200 Series IP Deskphones-Administration September 2013
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