[Sipp-users] How Content length is updated

[Yariv O. <Ya...@ra...>]

Hi

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

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If we take a look of and example:

Content-Length: [len]
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v=3D0
o=3Duser1 53655765 2353687637 IN IP[local_ip_type] [local_ip]
s=3D-
c=3DIN IP[local_ip_type] [local_ip]
t=3D0 0
m=3Daudio [auto_media_port] RTP/AVP 8
a=3Drtpmap:8 PCMA/8000
a=3Drtpmap:101 telephone-event/8000
a=3Dfmtp:101 0-11,16
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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.
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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?
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Regards, Yariv
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