Troubleshoot SIP

#Firewall

Allow your PBX to reach the SIP server on these ports, and allow the replies back:

#The trunk won't register

• Copy the username and password again. Passwords are shown once, so generate a new one if in doubt, then update your PBX.
• Check that the SIP server and port match the trunk page exactly.
• Check that outbound UDP 5060 isn't blocked. Try TCP if your network mangles UDP.
• Repeated failed attempts from one address are blocked for a while. Wait before retrying after several bad passwords.

#Calls to 7777 fail

• Check the outbound route sends 7777 down the BluePenguin trunk and doesn't strip or add digits.
• For IP trunks, check that the PBX's public IP is in the trunk's list.
• Check that your plan has minutes left and the AI is switched on under Call handling.

#One-way or no audio

• Allow UDP 10000 to 10999 in both directions.
• Turn off SIP ALG on your router. It rewrites SIP packets and often breaks audio.
• Make sure G.711 μ-law or A-law is enabled on the trunk.

#Transfers don't reach the extension

• The transfer target's destination must be the extension number as your PBX dials it.
• Check that calls arriving from the trunk may reach internal extensions (the inbound context).