Its about const correctness, which is a good idea especially for API or core Code. https://isocpp.org/wiki/faq/const-correctness#overview-const

From: sr-dev <sr-dev-bounces@lists.kamailio.org> on behalf of Daniel-Constantin Mierla <notifications@github.com>
Sent: Friday, May 20, 2022 2:32:08 PM
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Subject: Re: [sr-dev] [kamailio/kamailio] core: const correctness (PR #3120)

Can you provide more details why these changes are useful or necessary?

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