Accept-Encoding:
Accept-Language:
Accept:
alert
Alert-Info:
algorithm=
Allow:
application
Apr
audio
Aug
auth
auth-int
Authentication-Info:
Authorization:
branch
branch=
c:
Call-ID:
Call-Info:
card
cnonce=
Contact:
Content-Disposition:
Content-Encoding:
Content-Language:
Content-Length:
Content-Type:
CSeq:
Date:
Dec
Digest:
domain=
duration=
e:
emergency
Error-Info:
Expires:
expires=
f:
false
Feb
Fri
From:
GMT
handling=
i:
icon
image
In-Reply-To:
info
ip
Jan
Jul
Jun
k:
l:
lr
m:
maddr=
Mar
Max-Forwards:
May
message
MIME-Version:
Min-Expires:
Mon
multipart
nc=
nextnonce=
non-urgent
nonce=
normal
Nov
Oct
opaque=
optional
Organization:
phone
Priority:
Proxy-Authenticate:
Proxy-Authorization:
Proxy-Require:
purpose=
q=
qop=
realm=
received=
Record-Route:
render
Reply-To:
Require:
required
response=
Retry-After:
Route:
rspauth=
s:
Sat
SCTP
sctp
Sep
Server:
session
SIP
stale=
Subject:
Sun
Supported:
t:
tag=
TCP
tcp
text
Thu
Timestamp:
TLS
tls
To
true
ttl=
Tue
UDP
udp
Unsupported:
urgent
uri=
User-Agent:
username=
v:
Via:
video
Warning:
Wed
WWW-Authenticate:
x-