I don't think macro replacement works inside of strings. I believe you should be able to achieve what you want using #!defexp, as the examples in the core documentation are nearly identical to your example.

#!define IPADDR 127.0.0.1

#!defexp SIPURI "sip:" + IPADDR + ":5060"
#!defexp QSIPURI '"sip:' + IPADDR + ':5060"'

#!defexp V16 1<<4

Another possibility is using modparamx() and interpolating your strings there:

#!defenv MYSQL_IP 

#!modparamx("permissions, "db_url", "mysql://kamailio:kamailio@$def(MYSQL_IP)/kamailio");

Or even just:

#!modparamx("permissions, "db_url", "mysql://kamailio:kamailio@$env(MYSQL_IP)/kamailio");

The last form having the advantage that it's not available via the core.ppdefines_full rpc function thus reducing one possible point of exposure.

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