Why is a phone call making a DNS query?
Is this related to Softphone / VOIP in any way?
If the phone is behind a NAT firewall / router it may need external help to receive calls: https://support.aa.net.uk/VoIP_NAT
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If the phone is behind a NAT firewall / router it may need external help to receive calls: https://support.aa.net.uk/VoIP_NAT