SIP Trunk PBX behind NAT

Hey guys! I’m having trouble connecting my PBX to my SIP Trunk provider.
I think the message might reach the provider, but the provider’s message doesn’t reach my PBX since it’s behind NAT. I’m running the PBX in virtualbox connected to the hotspot on my computer

This is my configuration:

provider peer
[flowroute]
type=friend
secret=
username=
host=sip.flowroute.com
dtmfmode=rfc2833
context=ext-did
canreinvite=no
allow=ulaw
insecure=port,invite
fromdomain=sip.flowroute.com
nat=force_rport,comedia

(I assume those are the important bits, but if you need debug information feel free to ask)

Thank you in advance!

Have you forwarded the SIP and RTP ports on the router? Does the output of “sip set debug on” show responses from Flowroute?

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I get no responses from Flowroute, and I can’t modify my router settings