Unable to lookup hosts in Asterisk/FreePBX

Symptom:

resolve_first: Unable to lookup ‘­sip.zadarma.com’

ast_sockaddr_resolve: getaddrinfo(“host250-195-58-185.serverdedicati.aruba.it”, “(null)”, …): Name or service not known

Resolution:

1/ Point DNS server in /etc/resolv.conf

nameserver xxx.xxx.xxx.xxx

2/ Edit file /etc/asterisk/dnsmgr.conf

[general]
enable=yes

refreshinterval=1200

3/ Edit file /etc/asterisk/sip_general_additional.conf

srvlookup=yes

4/ execute command “amportal restart“