Sangoma P series remote provisioning

i am wondering is there anyway to zero touch remote provision for P series phone, without opening sip port (5060) to public?
they way i do for Sangoma S series is i only open openvpn port and https provisioning port and then enter the phone mac address in sangoma portal and make the chenges for the pbx deployment ID. the rest is simple. just add the phone mac and extension in endpoint manager .
but for the P series have to open 5060 port for DPMA that i do not like.

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