> In Henning's presentation slide on SIP (August 2000 version),
> it is stated that the size for a full SIP message is 359 bytes, of which
> the component 'other' contributes 72 bytes. May I know what does 'other'
> consist of?
I don't know offhand which slide you're referring to, but...
SIP messages are of variable size. Widely, widely, variable.
As they progress through a network of proxies, they will grow,
by the addition of Via (and possibly Record-Route headers).
There are many headers (e.g. "Server:," "Date:") which are
optional.
What Henning's slide is probably referring to is one of the smallest,
syntatactically complete, semantically useful SIP INVITE messages.
Such a message would look something like:
---------------------------------------------------------------------------
INVITE sip:[EMAIL PROTECTED] SIP/2.0
T: sip:[EMAIL PROTECTED]
F: [EMAIL PROTECTED]
C: [EMAIL PROTECTED]
I: [EMAIL PROTECTED]
CSeq: 9 INVITE
V: SIP/2.0/UDP 10.10.10.10
L: xxx
v=0
o=b 97438978197648642 0 IN IP4 10.10.10.10
s=-
c=IN IP4 10.10.10.10
t=0 0
m=audio 6000 RTP/AVP 0
---------------------------------------------------------------------------
This is about 252 bytes, but is horribly artificial. In practice, our
testing client generates messages that are about 766 bytes long.
Anyway, you can pick through the sample extremely small SIP message
I've included above to try to figure out what this "other" stuff
may be. Although I suspect that whatever answer you get won't be
very useful.
/a
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