AudioCodes 420HD - SIP Headers

400HD Series IP Phones
Administrator's Manual 322 Document #: LTRT-11950
E.1.2 SIP Headers
The device supports the following SIP Headers:
Table E-3: Supported SIP Headers
Header Field Supported
Accept Yes
Alert-Info Yes
Allow Yes
Authorization Yes
Call-ID Yes
Call-Info Yes
Contact Yes
Content-Length Yes
Content-Type Yes
Cseq Yes
Date Yes
Diversion Yes
Encryption No
Expires Yes
Fax Yes
From Yes
History-Info Yes
Join Yes
Max-Forwards Yes
MIN-SE Yes
P-Asserted-Identity Yes
P-Preferred-Identity Yes
Proxy- Authenticate Yes
Proxy- Authorization Yes
Prack Yes
Record- Route Yes
Refer-To Yes
Referred-By Yes
Replaces Yes
Remote-Party-ID Yes
Retry-After Yes