[sr-dev] [kamailio] dialog: Enabling track_cseq_updates causes message parsing to fail (#526)

[Erik Davidson]

I've tracked this issue down to a combination of using HEP mode siptrace and turning on the track_cseq_updates at the same time.  It looks like when HEP mode is turned on it adds the HEP header in front of the message it's duplicating, then uses msg_send() to send it.  When this happens the callback for SREV_NET_DATA_OUT triggers dlg_cseq_msg_sent() in the dialog module which runs a parse_msg() on the buffer sent in.  Since the buffer has the HEP data in the front when it tries to parse the message it leads to a parse error.

I'm not sure how to fix this, though, since there's really only this special case where msg_send() has some additional metadata at the beginning of the data.

This is a minimal config that reproduces the issue: [kam-cseq-parse-error.txt](https://github.com/kamailio/kamailio/files/155253/kam-cseq-parse-error.txt)



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https://github.com/kamailio/kamailio/issues/526#issuecomment-191327909
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