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Hi, VAPI is returning BUSY randomly when we call v...
# support
p
We're transferring calls to VAPI and its returning randomly Busy Here 480 Temporaryly unavailable Can anyone show us?
v
Hi there! 👋 I understand you're experiencing random BUSY signals and 480 Temporarily Unavailable errors when transferring calls to VAPI via SIP Trunk. Let me help you troubleshoot this issue. Based on the documentation I've found, here are several potential causes and solutions: For the 480 Temporarily Unavailable error: 1. Firewall Configuration - Check if your firewall settings are blocking SIP messages or if SIP ALG settings are interfering with the communication [source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334919245468799007) 2. SIP System Configuration - Verify that all required headers and authentication methods expected by your SIP system are properly configured [source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334919245468799007) 3. Network Connectivity - Ensure correct IP and port configurations and check for NAT traversal issues [source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334001638876250233) 4. SIP URI Configuration - Make sure your 
sipUri
is correctly configured and credentials are properly provisioned [source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1340082214146146435) For the random BUSY signals: 1. Concurrency Limits - VAPI may return busy signals when it reaches its concurrency limit to ensure quality service [source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334517022893150218) 2. SIP REFER Handling - VAPI uses SIP REFER for call transfers. Ensure your receiving system (PBX) can handle these messages properly [source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1333747605628391434)
3. SIP Compatibility - Verify that the codecs used in your SIP communication are compatible with both VAPI and your SIP provider [source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336705023106744350) Recommended troubleshooting steps: 1. Check your SIP configuration and ensure the 
sipUri
points to a valid address 2. Review your network settings, including firewall configurations 3. Verify your system can handle SIP REFER messages 4. Request logs from your SIP server to identify specific issues 5. Test calls after each configuration change I hope this helps! Let me know if you need any clarification or have additional questions about these troubleshooting steps. Sources: - [Firewall Configuration](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334919245468799007) - [SIP System Configuration](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334919245468799007) - [Network Connectivity](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334001638876250233) - [SIP URI Configuration](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1340082214146146435) - [Concurrency Limits](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334517022893150218) - [SIP REFER Handling](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1333747605628391434) - [SIP Compatibility](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336705023106744350)
p
Its failing randomly
everything works, and suddenly stops working
and starts working again
n
What is your gateway?
p
I'm calling directly from the internet, no gateway
Is working again
https://status.vapi.ai doesnt reflect any problem
As you can imagine, not even a single channel is being used
k
hey @pasamelo could you share the phone number ID so I could take a look?
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