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Troubleshooting Articles

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Answers to common VoIP and Hosted PBX problems

• 3CX Suddenly Loses SIP Trunk Registration
• Calls dropping after 30 seconds on NEC PBX
• Can't Receive Incoming Calls
• Cannot connect over Optus 4G
• Cant make outbound calls on Grandstream handsets
• Cisco SPA112 and SPA122 - Retrieving the Base IP Address
• Conducting a Packet Capture on Yealink
• Error 503 / Server Unavailable / Could Not Connect to Server
• Error Code 5xx
• Ghost Calls
• Internet Service Providers Blocking SIP
• Known Incompatible Routers
• NAT Issues
• Running an MTR
• SIP ALG
• Virtual Fax Troubleshooting
• Yealink Cordless Phones - Only One or No Phones Ringing
• Yealink W60 / W52 / W56 Cordless Phones - How to get the Base IP address

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