How to find the size of Content-Length field

[gpulipati@xxxxxxxxx (Guru Prakash Pulipati)]

Hi All

I am planning to write pack/unpack functions for sip messages,
but I am stuck with some fields as I dont know there size.

for example,
"Content-Length" which specifies the size of the SIP message body,
but where can I get the size of the Content-Length field.

thanks in advance..

Regards
Guru
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