Yes – it fills in the packet first – it leaves 4 spaces for the length to go in. There is a race to do things at the end with the Authentication logic but otherwise it is OK.

 

It looks for the blank line – so you don’t have to put the Content-Length last. (Without looking at the code I cannot remember whether it looks after the [len] or from start of packet.)

 

Peter

Peter Higginson

Newport Networks Ltd,

Direct line 01494 470694

http://www.newport-networks.com/


From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Yariv Omer
Sent: 07 November 2006 09:09
To: [email protected]
Subject: [Sipp-users] How Content length is updated

 

Hi

 

I am trying to understand how the content length is computed, and in which phases?

 

If we take a look of and example:

Content-Length: [len]
 
v=0
o=user1 53655765 2353687637 IN IP[local_ip_type] [local_ip]
s=-
c=IN IP[local_ip_type] [local_ip]
t=0 0
m=audio [auto_media_port] RTP/AVP 8
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-11,16
 
The [len] keyword will be computed in run time only after the 'local_ip' and 'auto_media_port' (and maybe other fields from a file for example) will be computed.
 
Does for each call, Sipp first put all the keywords of the body and then compute its length and then fills the 'len' keyword?
How does it knows where the body starts?
 
Regards, Yariv
 
 

 




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