"This phone number cannot be connected. Please try again later." This is the error I get when I call my phone number that is sip trunked into vapi. Why? Was my SIP trunking wrong? Did I forget to set something up in Vapi? I cannot find the mistake.

Hi there! That error message typically appears due to SIP configuration issues. Let me help you troubleshoot 🔍 Based on our documentation, here are the most common causes for this error: 1. **SIP Configuration Issues**: - Misconfigured SIP trunk settings (Credential ID, IP/Port, Authentication) - Incorrect

sipUri

format in your API call - SIP Register not properly enabled with correct Domain and Realm [Source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1333747605628391434) 2. **Network Connectivity**: - Firewall blocking SIP traffic (usually UDP port 5060) - NAT configuration issues - High latency connecting to Vapi's servers [Source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1334919245468799007) 3. **SIP Server Configuration**: - Issues handling SIP REFER messages (Vapi uses these for call transfers) - SIP server compatibility problems [Source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1344680024665493524) 4. **Authentication Issues**: - Incorrect username/password combinations - API request errors (including unnecessary properties) [Source](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1336343455601093267) To troubleshoot, I recommend checking: - Your gateway configuration (should use

sip.vapi.ai

for inbound calls on port 5060) - Your SIP trunk credential setup - Your PBX configuration (especially the SIP URI format) - Firewall settings to ensure SIP traffic is allowed If you could share more details about your specific setup, I might be able to help pinpoint the issue more precisely! Sources: - [Discord Thread about SIP Configuration Issues](https://discord.com/channels/1211482211119796234/1211483291191083018/threads/1333747605628391434)

If one if the admins can help me, I can send you a picture of my SIP trunking. I don't know what why it gives me an error. I guess it is something in the trunking

Hey @UKO, can you record a loom video of the error you're getting and share your phone number so I can take a look?

Yes, of course

I've looked into the video shared into the DM. The problem statement was clear, but the video content (in between the API request and other things) were not visible enough for my eyes, so I requested to share the phone number ID so that I can look for the relevant logs or anything related to it in our logs and then come back to you. Meanwhile, if required, you can also book a slot with me through this Calendly link