app asterisk models py from django db import models class Sip models M

#app/asterisk/models.py
from django.db import models

class Sip(models.Model):
    name = models.CharField(max_length=20, null=False, blank=False)
    ...

#app/provisioninig/models.py
from django.db import models
from app.asterisk.models import *
from app.provisioning import prov

class Device(models.Model):
    mac = models.CharField(max_length=12, unique=True)
    ...

class Line(models.Model):
    device = models.ForeignKey(Device)
    sip = models.ForeignKey('asterisk.Sip', unique=True)
    ....

    def save(self):
        super(Line, self).save()

        if self.device.dev_model.vendor == 'Cisco':
            prov.make_smth(self.device)

#app/provisioning/prov.py
from app.asterisk.models import *
from app.provisioning.models import *
def make_smth(device):
    lines = Line.objects.filter(device__mac = device.mac).values()