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You need fix line 142 and add additional \r\n at the end of packet, as it described in RFC 3261 p.7 (SIP RFC):
...
Both Request (section 7.1) and Response (section 7.2) messages use
the basic format of RFC 2822 [3], even though the syntax differs in
character set and syntax specifics. (SIP allows header fields that
would not be valid RFC 2822 header fields, for example.) Both types
of messages consist of a start-line, one or more header fields, an
empty line indicating the end of the header fields, and an optional
message-body.

     generic-message  =  start-line
                         *message-header
                         CRLF
                         [ message-body ]

...
and RFC 2822 p.2.2:
...
Header fields are lines composed of a field name, followed by a colon
(":"), followed by a field body, and terminated by CRLF.
...

So, you need end header field with CRLF and then end header section with CRLF.

In current situation, as example, kamailio sanity check report ERROR on script generated OPTIONS packet