I read the simple remote phone configuration guide and I need some clarification regarding the below:
match header sip-status-line match-value /200/
match header CSeq match-value /REGISTER/i
modify header contact position first-match match-value /(;expires=)\d+/i new-value /\155/
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So to better work with SIP Header Manipulation Operation , I have to understand the function of each SIP Headers and to perfectly understand the regular expression
SIP Header Manipulation is very technical and requires a deep understanding of the headers used. It is a powerful feature that should be used with caution.