Rest all being good, the issue was the credentials from chan_sip module (sip.conf) were being picked up.
Do these:
asterisk -rx "module show like chan_sip"
asterisk -rx "module unload chan_sip.so"
# persistently disable:
sudo sed -i 's/^load=chan_sip\.so$/noload=chan_sip.so/' /etc/asterisk/modules.conf || echo 'noload=chan_sip.so' | sudo tee -a /etc/asterisk/modules.conf

Sreekumar (KJ) has been a hobby programmer from school days. Codemarvels is his personal blog from the year 2010, where he writes about technology, philosophy, society and a bit about physics.
He now runs a conversational AI company – DheeYantra – focusing his efforts to help businesses improve operational efficiency using digital employees powered by AI.
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