Proxy converts SIP HGC 503 to 500
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In MOR/Opensips: To resolve this problem, following line should be added to /usr/local/etc/opensips/opensips.cfg :
disable_503_translation = yes
In M2/Kamailio: Add the following line in /usr/local/etc/kamailio/kamailio.cfg in tm params section:
modparam("tm", "remap_503_500", 0)
And restart proxy
service kamailio restart
