SIP Problems on 155

@ewald Hello ewald

I recommended you if something works without opening from outside to inside (portforwarding), then prefer this way. Iam a big fan from only open if its absolute necessary!

My own experience how Voip works for me since several years in orange, ipv4 only (no CGN)

  • without portforwardings
  • without ALG (from beginning i never needed this)
  • without SIP Proxy
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