Hello, I just set up my own SIP Trunk via Provider Keys > SIP Trunk Credentials DID: 61240818332 I have attached file on how I set it up. However every time we're trying to call the number, it's having a busy line. Please advise if I did the correct set up Thank you, https://cdn.discordapp.com/attachments/1368962492809740479/1368962492948021359/image.png?ex=681a212c&is=6818cfac&hm=39b3055ea852694a1e9a3b3d45de9d77ba7dfe0b108be0545bbcedf59427f7bb& https://cdn.discordapp.com/attachments/1368962492809740479/1368962493401141288/image.png?ex=681a212c&is=6818cfac&hm=ff287835ea03311c73c2869397f4559ddf6ffb9d369c27cbcee8855c55cf7bf9&

Check if your assistant has reached its call concurrency limit, which would cause incoming calls to receive a busy signal. Also verify your SIP server is configured to accept calls from Vapi's servers by ensuring:

# Key settings to verify
- Firewall allows SIP traffic (UDP port 5060)
- SIP server accepts calls from sip.vapi.ai
- Authentication credentials are correct
- System handles SIP REFER messages

Try enabling options ping to maintain connection status awareness. Sources: - [Discord discussion on busy line errors](https://discord.com/channels/1211482211119796234/1334517022893150218) - [Discord discussion on SIP configuration](https://discord.com/channels/1211482211119796234/1336713212233515089)

Before I get to this, I am still using a free plan, (still on development stage) is it causing the busy tone?

Hey! To help track down this issue, could you share: - The call ID This would really help us figure out what went wrong!

THanks, how can I get the call ID? Will it register to the call log even we get a busy tone?

@Kings_big💫 can you help @negoDev to share the required information.

From the API response when starting a call, from webhook event payloads, or by querying the call details using the call ID via the API.

Thanks, the thing is we have not get into a call, so when we dial the number that we registered into our vapi, it's getting a busy tone. Also we have not integrate vapi to any of our system, we just use the vapi dashboard for inbound call just like this Customer -> Call number we registerd in vapi (via BYO SIP Trunk) -> Vapi Assistant -> Assistant booked job to our system by trigerring our webhook. The flow is already working the only issue we have left now is the number that we registered in vapi can not be reached

Can you provide your phoneNumber id?

Sure, here it is 604711da-dce7-4c25-aa96-5a74cc7a75d1

Hey, Could you please schedule a brief call at your convenience so we can discuss this matter in detail? Kindly use the following link to book a suitable time: .

Hello, your available time is already in next month? Do you have 11PM Hongkong time slots available? I believe you are in US time zone that would be around 10AM your time? It will be more convenient in your end? Please let me know the soonest. I already sent an email request to support@vapi.ai I have attached my email, I am that person https://cdn.discordapp.com/attachments/1368962492809740479/1372590488661524630/image.png?ex=68275401&is=68260281&hm=838600fe49b601346b1c967aba9981869c879b70c2e559ea0ef5c3679a4c1aec&

We have limited availability for this month and we apologize for the inconvenience

I switched to Twilio now, I tried the sip integration, I followed everything in this link https://docs.vapi.ai/advanced/sip/twilio But when we dial the number, it's already ringing and connected but there is a message that says "no routes found"

Hey! To help track down this issue, could you share: - The call ID This would really help us figure out what went wrong!

All good we sorted the issue, I have one more thing not related, how do I promp the assistant to get the current phone number of the caller using?

You will need to pass the caller phone number which can do it via dynamic variable

@negoDev Can you share the fix?

This ticket has been marked as solved, and as a result, you will no longer receive any further responses. Kindly create a new support ticket to escalate your inquiry.